Breaking the law in other words.

PoS is sort of hard to bootstrap. ETH moved to it which was quite an achievement, but it’s difficult to see how it might have started that way.

If Bitcoin fails then it seems to me the bottom will fall out of all of crypto So all of it still depends on PoW propping up BTC.

Sure but you skip across borders, use mixers, over the counter trades and dodgy offshore exchanges.

It’s not that hard to cover your tracks. And sometimes it doesn’t matter if your beyond the reach of the authorities in the country the crimes were committed.

Yeah but “being your own bank”, keeping all your savings under the mattress, makes your house a lot more inviting target.

Likewise being able to ransom people half way across the world and knowing there is an irreversible way you can get them to transfer the money across borders makes ransomware possible.