How or in what way will knowing this help you? You should focus on running your own race to the finish line rather than allow your self to be distracted by how other people are running their own race..
Even if you are able to find out the wallet whales store their bitcoin, whether it be one, two or more wallet, knowing this will not add a single bitcoin to your own wallet, why not focus on accumulating your own bitcoin?

If you have that kind of money, (like you put it, 10's of billions) you already have a good level of authority yourself, so which ever or what ever way you choose to invest it is no business of the authorities as long as you are not laundering the money or sponsoring human, drug or weapon trafficking.

We cannot, for the same reason we can't do it on gold. We can only determine the market cap, which isn't kind of the same thing.

Tens of billions? With the authorities not knowing a thing? No, I doubt.

It would not be very easy, but where there is a will there is a way. The big problem with that would be to move fiat without many fuss. Buying Bitcoin woild not be the problem, the iasue would always be with fiat.

They are sharing volume though and there's blockchain data with transfers to known exchange wallets. There are chain analytics that focus on this and you can find all of it if you do a bit of googling.

Whether those are whales or not is difficult to tell because if I wanted to buy 1000 bitcoin and I did it all on binance that has a known wallet and makes their volume public people would know but I don't have to do it.

I can buy everything OTC or I can buy some of it OTC, or keep buying 100 coins each month, every time on a different exchange and every time into a different wallet. You wouldn't even know.

You can have some notion by accessing this website where they classify bitcoin's addresses by how many bitcoins each of them holds.
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html

Wealthiest addresses must belong to exchanges' wallets, not individual investors.

Total invested money in BTC should be the total number of coins in circulation multiplied by currently BTC's price, no?

knowing how much money went through bitcoin is impossible

watching exchange trade volume is meaningless. someone can arbitrage the same 1btc in a multi currency hop loop multiple times to multiply volume

looking for exchange deposit and withdrawals dont correlate to actual market order listings/exchanging. it can just be custodian holds for a different time/price

comparing satoshi's stash of 1m coins at $0.001-$0.01each to say all of michael saylors trade dates of his 135k coin.. to say grayscales trust deposit dates. brings such a random average that it becomes meaningless of any precise figure that its not even worth trying to gather such known entities acquisitions

using UTXO age does not correlate to peoples fiat trades, its just their wallet shuffling dates which could be movements for a variety of reasons and not trading against fiat when utxo dates move

and no before you dare suggest it. no market cap is not a representation of some hoard of fiat.. its just a math number of a single order of any amount calculatedmultiplied against all coins of circulation. totally meaningless

When we talked about tracking, then surely they can track you because when you see some thread today, they can actually see some huge amount of BTC being moved to another wallet and some newbies always became alarmed and posted it here. I guess you can find a way not to get tracked when you have that huge amount of money to invest but surely the entire crypto market will react to that because it will gonna be surely a huge fuss when they see the huge percentage of the price increase.

I guess whales nowadays are dividing their investment to hide from these people who always track them and some of them may be already exited the market from the fear of getting caught because they might gonna face some changes especially when their country has tight rules against BTC.

1.You would need to gather all the info from all cryptocurrency exchange platforms in the world about all Bitcoin purchases. I highly doubt that the crypto exchange platforms would reveal such information. Years ago, multiple crypto exchanges were faking their trading volume, in order to look bigger and more reputable. Maybe these unethical practices remain in some of them.
2.No, it's no possible. Even if a bunch of billionaires are hiding billions of dollars in offshore bank accounts, which are located in "tax heaven" islands, the authorities can find a way to track those money.

Through its marketcap.

There are OTC transactions but if you're asking about without being tracked then you have to go with the P2P way. Like the actual trades that do happen personally.

Because in P2P trading platforms, you can still be tracked by the exchanged if ever the authorities asks for your transaction details from them.