I am struggling to think of any better system than BTC. Almost anything else I can think of would require either (a) substansal amount of starting cash (for ex

I am struggling to think of any better system than BTC. Almost anything else I can think of would require either (a) substansal amount of starting cash (for example trying to crash Tesla's stock price), or (b) be almost impossible to pull off without getting caught (blackmail, or again stock manipulation if you do it in a big enough way to make some decent money). In terms of risk/reward, assuming someone found some easy trick and wanted to cash out ASAP, this feels like the best option.