Also imagine the data they can harvest. Porn is the gateway drug to make people use them as emotional support, telling them secrets they might never tell on the open internet. Imagine the ad targeting opportunities
Will actually open more ad opportunities of marketing more private contents and detecting preferences at higher level. This data will also of course cater to more advertising money from questionable industries, which in the end goes to Facebook coffer and they can shrug saying, they only provide a platform, whatever people are buying or clicking is whatever people want, otherwise they wouldn't be clicking those ads.