OP wanted <50,000 subscriibers. That's the only one I have in my subscriptions that qualifies 🙂 I have a boatload of <100,000 and <150,000 subscribers in my list though, and they're really interesting but that's not what the OP wanted so I didn't post them.
Ty & that guy - I think it's done now but there is plenty of content for fans of The Expanse. Ty Frank(1 of 2 that form the author, S.A. Corey) and Wes Chatham(Amos from the show) talk about every episode of the show and when they finished that, they talked about movies they like. Wes is pretty funny and Ty is just really intelligent.
Artifactually Speaking: An actual archaeologist bringing you exclusive footage and explanations, working theories from the digs he works around Ur. His video correcting some of Miniminuteman's mistakes is probably what he is most known for. But this one, where he follows an expert's tour of an ancient house, with explanatory interjections, and a very human story in the middle, might be his best. As well as the continuation of that video, where we follow the careful retrieval of ancient tablets.
It's a weekly news report, but all the subjects are C-list conspiracy theorists.
The show is named after a British Conspiracy theorist called Mark Steele - this guy literally made a show a week about Steele until nobody would associate with him and he shut down his channel.
These days he makes videos about another conspiracy influencer - Richard Vobes. He said he's going to keep making videos about the guy until Vobes shuts down his channel.