Eating disorders and dieting are not the same thing.
Don't censor any discussion, but give users options on what things to hide, preferably with open source algorithms that anyone can create and share.
I think that's a question for society, but also for the people working at the platform. For example, if you read interviews with 4chan founder Christopher "Moot" Poole, you'll see that he started out with a similar ethos to yours. He ended up reining in things some over time, still grew miserable with what he created, and eventually quit.
The problem is much larger for a platform that aims to be larger and not generally despised. If you look through the big platform rules, it's worth thinking about each item from a perspective of, "Am I happy devoting my life to enabling that?" E.g., the people who are into CSAM don't want protection from content their are choosing to engage with, just like you. But how many people want to go to work each day and say, "Yay, another day of supporting machinery to distribute child porn across the globe?"
A grocery store doesn't let people walk around in their store saying just anything to their customers. They're (rightfully) not bound by as high of a standard for what they allow to be said in their store as the government's standard for how much they'll let you say before they imprison you.
> photos or videos of thin girls and women
> Motivational texts, sayings and quotes for losing weight
?
> photos or videos of extremely thin girls and women or bodies that serve as weight loss motivation and ideal images
When ED issues come up, especially in teens, concerning topics are usually (not limited to)
-How to hide it better from your parents/friends
-how to be more efficient at it
-selfies of teens showing dangerously low body fat as "goals"
-shaming of people for eating (at all)
-coaching people who are vulnerable from other conditions into ED as a way to feel better.
Bear in mind in some cases were talking about people who will be trying to hide that all they consume is (relatively common amount) half a small orange and 1 egg white a day and as little water as possible.
It's not 'dieting'. It's a mental health condition that, untreated, leads to death.