Not only are people greedy in cryptocurrencies, but people in any investment industry are greedy. Don't trust anyone, not even your friends. Don't put all your money on exchanges.
Putting money or rather the better term is storing money on exchanges. There is always some people who will keep doing this and the people who do such things are not visiting this forum regularly.
Being greedy is common but bad luck can hit and exchanges getting hacked is pretty common. We have to reduce the amount of money kept there for regular transaction as much as possible.
Offline wallets are always safer as compared to online wallets.
I have to be a bit ashamed to admit that some of my money is in binance and I am not planning on taking it out.
Its true that I distributed my money into 4-5 different places, some of them are quite secure (my ledger nano) and some of them are semi-secure (metamask) but some of them are not so secure or at least secure but not guaranteed like the money in binance. Thats the type of business we are in, binance is all the action is taking place, so I trust them, and they are much larger than FTX, so its not as bad and not as risky as that so I feel like it shouldn't be a problem. I know people will say thats still a bad decision, but I feel like its really not that big of a deal.