It's like Google, they don't care what ads being showed as long as you getting paid, why should it be different here?
Certainly not. Through google ads, you can run an ad on ponzi scheme, a scam site, a phishing site even sometimes. Would you be able to promote them here? You can't. I believe theymos would never allow a scam site or a ponzi scheme. There are other projects too which want to advertise here, getting money isn’t the only factor.