Social media algorithm are being used to push agenda from other countries, see the Cambridge analytica case, or push extremist content to youngsters since it generates much more engagement.

Porn doesn't do this. It may have other issues, but it doesn't aim at maximing engagement with infinite scrolls and similar tactics. Let alone the content, who would watch porn for 12hrs/day? We already have the possibility to do that, and if somebody doesn't have mental issues, I'm of the opinion (s)he's not going to do that