This is because the exchanges are not regulated. Ie they do what they want. For example, if today the stock exchange closes and there are your funds, then you are unlikely to return them
Yes, crypto-exchanges are now in the golden age. That's why there are so many of these, and new ones appear every day. On the other hand, for small amounts (up to 2BTC/day) there is anonymity for all users. This allows us to carry out transit of funds without state control.
Anonymity is good. I'm only for, but no one is responsible for your money when they are on the stock exchange. And so it should not be