None of these youtubers stand out to me as exceptional photographers, maybe because they usually don't show their own work. I must say I only get inspired by truly excellent photographers and none of them are in that category as far as I'm concerned. That also means that I don't really care if they're specialist or generalist.
I know and that's how I think about some of them too, but there are a few on the list that aren't famous for their YouTube content.I don't follow any other photographers and only recognize a few names on that list, but most YouTube personalities, or "influencers" - no matter the genre - remind me of a quote I once saw about Paris Hilton: "She's famous for being famous.".