Like all good Ponzi schemes, they work until they don't. The crypto exchanges have a handy benefit of being able to block withdrawals in multiple ways, includi

Like all good Ponzi schemes, they work until they don't. The crypto exchanges have a handy benefit of being able to block withdrawals in multiple ways, including 'technical issues' or 'verification issues' etc. Problem is at some point (I.e. when they can't print tokens out of thin air any more) they still have to convince others to put new money in and it just becomes shuffling deck chairs on the Titanic...