Has StreetShares maybe pivoted a bit since you worked there? I'm looking at their website now, and it looks like they sell bonds and then invest the funds in veteran-owned businesses, so it seems like investors aren't directly exposed to any individual business. Honestly I don't see much in common with Mainvest, either in design or concept.

If StreetShares used to look like Mainvest but changed their model, and Felix believed in the original idea and decided to quit and try it again, what's wrong with that? It's like the Vine founders starting Byte, or the Screenhero founders starting Screen. Not only is copying ideas a core part of capitalism, but it barely even counts as copying when it's an idea you yourself worked on.