It’s the equivalent of idiots posting that wall of text on Facebook a decade or so ago saying they don’t give Facebook permission to use their pictures, posts…etc.

I think it’s quite different. On facebook, you have accepted a ToS telling that facebook now owns that data. Also, that “movement” was against facebook, the platform itself.
Here you haven’t accepted a ToS that wants to use your submissions for whatever they please (or did you?), and also, this movement is against outside parties, not the platform provider.