You're wrong here, Twitch doesn't ban gambling streamer e.g. Drake because he's gambling on sport betting, not luck based games e.g. slots, roulette, dice etc. The problem is Twitch banning the site e.g. Stake, if Stake separate his casino site and sportsbook site, of course they will can advertise on Twitch.
Youtube is worst than Twitch, so I don't think there's another good platform for Drake except Twitch since the other platforms doesn't popular.
They banned gambling from "unlicensed" providers and they consider any company with a Curacao gaming license as unlicensed. Obviously this was to put a blanket ban on most of the gambling content that people were publishing, though I suppose someone could possibly circumvent the ban if there are providers that Twitch considers to have legitimate licenses.
Youtube is worst than Twitch, so I don't think there's another good platform for Drake except Twitch since the other platforms doesn't popular.
Why is YouTube worse than twitch? They have massive global market share, just not in livestreaming. Their political censorship is overboard but I understand wanting to waive liability from the tech censorship overlords by banning discussion of contentious political topics. Gambling isn't as taboo so it seems like they allow gambling content to be published.