I'm thinking of this in the context of being an employer. As in, if you're going to hire people to be moderators, you can't destroy them as human beings.
If platform companies are responsible for the content on them, and they are hiring (even indirectly) people to moderate the content, and that content harms the moderators, then the company should be responsible for their care. Like, workplace disability, basically.
If platform companies are responsible for the content on them, and they are hiring (even indirectly) people to moderate the content, and that content harms the moderators, then the company should be responsible for their care. Like, workplace disability, basically.