"It's because, apparently, there had been a lot of child porn that was getting published." OR! It is pisses off advertisers. Large advertisers don't want thei

"It's because, apparently, there had been a lot of child porn that was getting published." OR! It is pisses off advertisers. Large advertisers don't want their ads on a page with porn and will yank budgets if it happens. Having to police which UGC tumbler page uses porn + ads is also impossible.