Bitcoin have transparent ledger. When you open Bitcoin blockchain explorer you can check any wallet and see what is there and where coins come from and when they will went. Everyone can see it.  When you have money in bank or wherever only bank know you have money there. And a hacker that hack the bank information's and the ones  that hacker sell those information. Or the one bank sell those information    Not everyone as with Bitcoin.  Lack of privacy is Bitcoin biggest flaw that sadly no one is aware of.