If you could get all of their content by default on follow, and then choose to opt out of kinds, that could work.
Discussion
Or a regular “Follow”, but if you click and hold (or right click etc) you get an option to “Custom Follow”.
I think the marketplace example is very good. Just because you’re selling a bunch of music gear that I might be interested in buying, doesn’t mean I want to see your social posts.
Yeah that could work