> Not just sanitizing, but sanitizing to US social mores. Showing a naked boob is considered porn and banned on most of these platform while public toplessness is perfectly legal in many jurisdictions worldwide.

Ironically, that set of jurisdictions includes all US national parks... See, for instance, https://www.tripsavvy.com/visiting-limantour-beach-1478617 - it's a lack of federal laws against public nudity.