We know how their business goes but you have zero risk in keeping your money in the bank until something wrong goes on.
Just like what happened in Lebanon and China, their deposits can't even take their money because that's what the government says so. And for you to avoid that, it's better for you to keep it on your own and just as we keep our bitcoin, you're also the one to hold your cash.
Even banks can't guarantee that your money is safe. There's still a situation like filing for bankruptcy that can take place. I also see your point with banks using your saving for lending other users.
They earn a lot of money compared to how much they are giving you on a year's basis,
If you know how crypto works, investing or saving your coins can bring decent profits
only if you understand both risk and profits.