This is the problem of decentralized, too open systems (aka anarchy): it enables terrorism, child porn, violent hate groups, organized crime and other extremists and criminals. There needs to be a reputation system and stronger limits to gradually give a user more access. Also, if they're required to pay for what they use (micropayment) to keep resources on servers, they're less likely to post illegal junk. Otherwise, crazy jerks will turn a free service into a Tragedy of the Commons, and everyone loses. We need more user-supported, non-profit sensible social media, productivity and other web apps to replace the for-profit and the wild-west ones that don't scale so well without major work. That being said, free often becomes junk because there's not the focus and professionalism to make something cool.
TL;DR - free doesn't scale without meaningful accountability
TL;DR - free doesn't scale without meaningful accountability