three reasons

A. most scammers dont steal $200,000 from one victim. instead they steal $500 from many victims where by each victim does not feel its worth fighting because after legal costs of chasing the money they waste more money. so just treat it as a loss and not chase the money
(the "buy $500 giftcard, grandma" scam)

B. most thieves that steal high amounts in total will hide an allotment away, so even if caught and do some jail time. after jail they are richer then getting a normal job for that jail time period

C.most thieves are too dumb to work normal jobs, they cant cope with the mental requirements to work, so steal things. they are not intelligent

I read the news. I do not saw the ponzi scheme as bitcoin ponzi scheme. I saw it as cryptocurrency ponzi scheme. The coins the scammer used is not talked about on the news.

Crypto can become traceable from mistakes. See monero transaction traced by Finnish authorities: https://cointelegraph.com/news/finnish-authorities-traced-monero-vastaamo-hack

Monero transaction can not be traced but likely the scammer made mistake and he was traced.

If the money is not huge, the hacker and scammer do get away with it. If it is bitcoin, mixers can be used. But know that humans are prone to mistakes that can let their anonymity to be leaked.

A huge percentage of those who scam get away with it. Very few cases gets global attention which attracts lots of chai analysis and tracking of the path of the funds.

There exists some safe havens where those whk want to live privately using Bitcoin without being tracked or forced to give up their privacy, this fortunately does not provide security for scammers.

BTC has a transparent and public blockchain, so the scammers must also understand the network and know how to use privacy solutions like mixers and CoinJoin implementations to be able to obscure all traces.

Take note that not too many scammers get caught, most of them are caught because their actions drew the attention of the government and blockchain analysis companies, and so they blacklist such addresses and confiscate its funds when it ever gets to a centralized exchange or custodial service. But if an attacker compromises your wallet and steals your funds that is not worth government attention, you cannot recover it.

In most cases, some Thieves don't get caught after stealing some millions of dollars, either in Bitcoin or in fait. Some Thieves too are so dumb that they could still get caught. 

@OP, what you must know is that their are different kinds of Thieves. Some Thieves or Scammers are highly educated. Their educational proficiency makes them so smart that they can pull any stunt and steal huge amount of money from different victims. After they have done so, they can go undercover for some months or even years, and while they are undercover, they could be living their normal lifestyle until they are convinced that the case of their theft has yet been dropped by the investigation agency, due to no very good trace after years of investigation. 

Scammers will continue to thief because it has become a profession for them, probably because they feel that is the only way they can get huge amount of money without legally working to earn such money. They have lost their conscience and moral, so it doesn't really concern them, what ever consequences they face in their dirty job. 

Do we actually have any even approximate statistics of percentage of scammers that get caught and those that get away? Because I have a feeling that it's easy to cherry-pick some high-profile examples, but looking at the bigger picture it might be the case that most scammers avoid justice.

Also, those scammers that steal millions and still get caught are often scamming for the first time and don't take enough measures to hide. Stealing millions in crypto is not a proof of skill because people so easily invest in anything that promises high returns.

It really depends on who you steal from. There are people you will steal from and they will let things go. There are also those that won't let things go even if you steal $1000 from them. Also when you steal what is not yours, nature is already against you, so every little efforts made to get to you will be fruitful.

There will never be valid statistics about scammers, thieves who get away will not be published, even those that are not detected as theft are still many. As @franky1 said, each thief takes a small portion of property from many people. What is impossible to happen is that the victims will find it difficult to form an alliance and report it to the police. The chance of this happening is almost close to 0%. This kind of fraud often uses cryptocurrency and BTC cover as its attraction.

There are also scammers that are not even detected by CCTV and the police, such as theft within the family area or smaller scope area. This will never be included in the calculation data and makes the accuracy of the data on escaped and caught thieves/scammer no longer valid.

Theft of large amounts of BTC will usually look to mixers as the first path they take. And the police will of course not remain silent when these large funds start to move, whether to mixers or other services.

Then this means one thing only !! NEVER SCAM OTHERS because what ever happens you will be caught or you will suffer everything in the future , it may not happen soon but in time .
no Sin that did not pay in lifetime or even after ,Live fair and life peace .

the effort to find a person randomly that has more then $200k that is willing to lose it is more then randomly calling thousands of people and only trying to scam $500

just look at all the scam-buster youtube videos.
leader scammers hire people that have no morals to run lots of different scams on millions of people. knowing that only 1% of millions of people will get hooked in. which still ends up as many thousands of people being scammed for small amounts. where by the moral-less employees get a cut of each scam they get. and the lead scam organiser takes the cut from each of those which soon add up

just look at all the HYIP scams in bitcoin in the 2013-16 era it was not scammer trying to get $200k. it was scammer trying to get $100 from thousands of people, amounts most would risk thinking if they lose it its not a big loss.. and thats how they get so many idiots handing them funds

just look at all the ICO scams and dodgy NFT stuff. they sell crap for <$#### by promoting that their token can reach the highs as the first promoted token sold to its self

scammers get away with it by what they call "low dollar crime=low detention time"
its no secret. tv shows been saying about it forever
heck even old TV shows like "the wire" were showing how drug dealers get away with it by not hauling KG bricks of drugs on the streets doing big deals, but instead 'dime bags' using mauls
where by if caught its not a federal level crime for the maul nor the boss, but a low level fine. scammers know what to do, where by even caught in a crime they have minimised their time. and hoarded their funds away to retrieve once free

the ones that get caught and do lengthy time are the category C of my last post