On top of that, our reputation and level system lets brands restrict missions to experienced farmers only (e.g. Level 5+). Bad actors get flagged early and never really become a problem. Since most starting missions come with modest rewards, there's simply no incentive to cheat. Try to game the system and your reputation takes the hit, meaning bigger, higher-paying missions stay out of reach.
Also, once we have a solid base of trusted users, disputes could be resolved through a community jury system: a random selection of verified members anonymously reviews both sides' submitted appeal/evidence and votes on a verdict. No central judge, just trusted peers. Would you agree to that kind of process as part of our Terms of Service?
That said, I'm not claiming this will be perfect, where there's money, there will always be people trying to exploit it.