Oh, 90% of crypto is programming and marketing and both costs a lot.

I don't know if you're being sarcastic but I think we'll eventually see AI isn't the silver bullet yet that can eliminate a human workforce. We're in the "promises" stage of crypto. We'll see if AI is smart enough to prevent fake ratings or if it's going to be a war of attrition between the programmers and the cheaters. To come to conclusion you need human supervision double checking the ratings anyway.
You are right AI will be not the problem in my opinion. The bigger problem will be what happens if some people start a smear campaign on you and a lot of people give you bad rating despite they don't know you.
That could be a problem and even more if some groups will be organized around it.
yes, fake reputation, thats the problem. even there is a private grub that only work for giving bad reputation, it will be big problem. some one will pay other to give him good repuation to. so, just wait and see how repu work