Thanks all for the good words. Not sure what to do next based on the opinions but I think they're right.

The problems:
- Legal
- Cheating

Is it really needed to have a company setup and any regulation at all? I mean, i'm not handling usd deposits, only crypto. Here in Spain crypto are not considered an asset.

Cheating, there is probably no way around this, maybe some kind of trust system?

Anyway, maybe I'll give it a go to sell it, if not, I just jump to another idea.