I know we all love finding out where the best massages joints in the Indian subcontinent are but hear me out.
Sure spammers have to solve captchas until they get a high enough score, but what if they had to solve even more? For example, if your score is between between -1 and -5 you have to solve two to make a submission. If it is between -6 and -10 you have to solve three, and so on. It seems like a good way to keep the mechanical turks busy instead of wasting our time reading about dubious health benefits.
So...shadow banning?