Having signed up myself out of curiosity, I can't actually find any method of paying for the service, which I find strange as you mention you're making a lot of

Having signed up myself out of curiosity, I can't actually find any method of paying for the service, which I find strange as you mention you're making a lot of money from this venture. For me, it just sounds like this project is merely a throwaway project and the aim is to get banned, at least then to get onto the Ads API where they may have another concept, but couldn't get on it any other way. Might be me, might just be extra dubious, but it doesn't look right to me.