Nothing needs to be feared in crypto, because everything we do must have risks. Because the possibility that happens a little if we save coins in the wallet online and at one time the site will disappear, actually I am not afraid because there is no way that could happen.
So you are not afraid to lose all your coins?
I don't believe in this
It's very risk to keep your coins in online wallets and a hack could happen easily
You should keep your coins with you, with your private keys and keep your PC safe
If you have a lot of money, it's recommended to use a hardware wallet