I heard about something that happened some time ago where a man won a huge some of money in gambling and he decided to save the money in a particular bank the money was there and later on the bank was closed down and he had to go through a lot of procedures to get his own money he was paid half of the money with promise of completing the payment soon, this won't happen if you saved with Bitcoin.
this can still happen to bitcoin holder who holds their bitcoin not in their own wallet with their owned seed phrase, but in exchange, as the case with mt.gox and ftx.
but overall if the bitcoin holder is conscious enough of self custody, then they'd be fine most of the time.
the one thing that I find so revolutioniary with bitcoin is the fact that you can access your money anywhere as long as you remember the seed phrase, basically you can be stranded in a jungle with some random scrap laptop you'd find on trash and as long as there's internet you can access it.