You can lose all your cryptocurrency for two reasons:
If the second scenario happens, you might think that it’s not you who was responsible for that and you are not the only one affected so, under crowd pressure the affected platform will have no choice but to reimburse your loss. Well, say that to the 127,000 creditors processing claims against Mt. Gox. Do you think they will ever get back the $2.4 trillion (worth of Bitcoin) they lost when the exchange went bankrupt due to a 650,000 BTC hack?