He is not really my coworker, but this seems like perfect opportunity to rant about this.

So, there is this guy, who asked me whether I want to join him in a project. I asked him what kind of project and what would each of us do. The project was Cryptocurrency Arbitrage and I would code the bot to do the stuff and he would design the logic to even out the money after the transfer. And we would get two thirds of the money and I would get the rest. I haven't said no yet, but ...