If it is totally non-fiat, where you can buy housing, food, fuel, devices, luxury items, etc., etc., etc., you would not need to cash out to fiat.

But seriously, in the current world, if we have a half-billion dollars "worth" of legitimate (or laundered) cryptocurrency, what can you do with it in the real world, especially contrasted to what we can do easily if we have a $$half-billion in legit $, €, £, or ¥ deposits?

I don't think we could even buy a Tesla or a pizza anymore. Maybe some things on Craigslist that take crypto?