> I don't think it's nonsense. Patreon, OnlyFans, etc are basically things that should've been apart of Twitter UX from the jump, all with a simple 'Subscribe ($X /month)' button, the overlap in their user interfaces is no accident. IG is already trying to do this as well already, but its niche limits its scale.

I'm not sure what you mean by its niche. There are way more Instagram users than Twitter ones, and they are way more exposed to products. It sounds like a much better fit for Instagram than Twitter.