It should be as much as possible to protect both, from securing the seed phrase and the device in possession (PC) but this is clearly the carelessness of his friend who stored the seed phrase carelessly, if not found then did not have access to the wallet.

Yes not only where to store lockers as a backup but we must also be able to avoid malware viruses on our computers, usually avoid downloading unclear sources and always check always from a definite source if you want to install from our device.

At its core we must be able to store properly and not be careless.

Some people don't bother to read instructions or manuals, they go straight to business and download, they're only concerned about memorizing and safekeeping their passwords. If it's the case with OP's friend, then he's is a matter of negligence, because if he had taken the time to read through details while opening the new wallet, definitely he'd have known the importance of seed phrase in wallets. I guess he has learned the hard way because $2000k is a lot of money to lose because of ignorance, let it be a lesson to newbies to be security conscious when opening wallets and when transacting cryptocurrencies.

very unfortunate for your friend. The story seems strange to me because the first thing we understand is to keep our phrase in a safe place. Surely someone must have told him when he was buying BTC that you have to keep the phrase first. I think the reason for this is not ignorance but carelessness. From this story, I concluded that he watched a YouTuber's video because an experienced crypto mentor will never suggest Trustwallet for storing bitcoin. Electrum is the best choice for BTC when using a hot wallet.

By the way, security is the first thing. Keeping the phrase in a safe place , keeping the wallet device safe from malware are some initial steps for any holder, regardless of whether they are a newbie or an experienced crypto user.

The private key or seed is the key to accessing the wallet - if you don't have the key then it's not your bitcoin.
Everyone should keep it a secret from everyone – even from your own family. Dropping it accidentally is an undesirable mistake - but when your friend puts it down on paper then I'm sure he cares about the safety of his assets. The problem here is not Bitcoin's iffy security, but rather pure user negligence.

If not reading this from you now that you have lost your pass to your Bitcoin once, I found it hard to believe when I read it online. Because as adults, I believe there should be some sort of seriousness in our dealings, not that we do things anyhow to the extent that we lose the pass to our asset's room, that's the height of it as far as I'm concerned. Besides, it's good to know how Bitcoin privacy and security work and the distinctions between the custodial and non-custodial wallets should have made anyone know how to go about their wallet securities. For custodial arrangements, one can still be careless with it and still get to recover their funds with the help of the company involved, which is the main advantage of custodial arrangements.

But those who are using the self-custody arrangement should know better, they must know that they are the banks of themselves, so they should not have been careless about it. I heard some stories of how people misplaced their millions of dollars through the self-custody arrangement but it still baffled me if it's really true as it shows how careless some people could be, as most think that everything informal should be careless about. No wonder they pay bitterly for it.

For me not just in Bitcoin but everything that would involve our money, banks, online wallets and even exchanges or trading sites.
Without security we are just risking our money by putting it on to their system, we need to secure our asset or money.
It is hard for me to trust some online wallet specially if their system has already been breached before that cost their customers to lost their money, but we should also be responsible to secure our accounts.

It's surprising how careless some people can be with their money. I mean, how in the world would you not know that something private, which you are asked to keep safe and secure when creating an account, can be kept in the open that too in a public place or a place where people come and go, even if it's a private room or something, one shouldn't be this careless with their money, earning money is a difficult thing, at least for most people. Some people make mistakes that make you wonder how reckless they are.

Not only Bitcoin, but finances and money are not for people who can't safely store and manage them well. You can't keep your debit or credit card along with its pin somewhere public and then expect that it won't be taken and no one would take the money out, of course, they will, you have offered it to them.

This is the height of carelessness and stupidity. What was he thinking? Even if he was leaving alone, what will it cost him to hide the seed phrase somewhere out of the reach of preying eyes. If your story is true, then a friend who has knowledge about cryptocurrency must have seen it and stolen the Bitcoin. The second golden rule is never make the same mistake twice, so next time, he's going to learn from his mistake and be very careful with his seed phrase.

2000USD in my country is quite a large amount. So if someone tries to invest with that amount then I am quite sure the people here will first study and make basic research. About wallets and also about how to secure them. So I am so surprised by your friend who is careless in terms of security. But I hope he learns a lesson from this incident and becomes more careful. And hopefully beginners here will also take lessons from this story. Because sometimes these basic things are the most important to learn and be reminded of. In fact, currently there are Hot Wallets that can allow users to immediately create a wallet without having to backup frase seed first. So beginners who are really beginners are prone to losing their own crypto wallet when they accidentally delete the hot wallet application.