Twitch streamers directly sell their creative works outside of the wage system. I think that puts them more in line with the artisan class than are movie stars

Only the small ones. Every single streamer of any consequential size for us to be talking about living off it also employs video editors, doesn't pay a team of volunteer moderators, and the larger you go the more people are in their teams as actual employed staff. Their name is the brand and name of a business employing a whole bunch of people that do work for them.