If a bank defrauds you in the UK you generally get the money back, there have been multiple cases. As to them having your money, that's what capital adequacy c

If a bank defrauds you in the UK you generally get the money back, there have been multiple cases. As to them having your money, that's what capital adequacy controls (another form of regulation) are for. banks are required to keep a percentage of their assets in low/no risk securities to mitigate the risk of insolvency due to bets going wrong. Many many many customers have been affected by hacks on crypto coin exchanges. To take one recent example I think the customers of Cream finance basically lost it all after cream were hacked for the 3rd time in a year. You can ofc lose money on the stock exchange, and in the UK there are regulations about what products can be offered to retail customers. things like leveraged investing are restricted. None of this is to say that financial regulations are perfect, they're very much not, but that there are reasons why they have evolved in the way they have, generally in response to the kind of things happening to the crypto market right now.