But:
> Is there a single site ... ?
is asking for a tiny bit of evidence (this is gentle curiousness; the antithesis of combative). Earnestly, are you able to provide one site that 'promotes eating disorders', so I can be educated?
If the answer is 'any site with charismatic too-slim people', isn't that extremely difficult to administer, and possibly become horribly discriminatory, for example if a site has a user profile of a beautiful but illegally[1] slender person, doesn't that 'promote eating disorders'? Would a site admin be legally compelled to block that user, or at least censor their profile pic?
I literally don't know what's legal vs illegal in this sphere, and suspect 99% of others are the same, and that probably includes the legislators themselves. Those claiming to know precisely what's il/legal in this context are probably overconfident.