Its not YouTube, but Dropout.tv probably has the best "TV style" gameshow content.

Hot Ones is always pretty entertaining

Taskmaster

Red Letter Media

Mike and Jay are a modern Siskel and Ebert. Film reviews, b-movie marathons and recently, a lot of trivia shows :D

British tv has a lot of shows for free on YouTube: Jimmy Carrs "I literally just told you", Taskmaster, Qi, would I lie to you, 8 out of 10 cats... These are all bbc productions, so literally tv shows. All are panel shows with a comedic purpose, and different approaches.

The entire Dropout channel looks like it's from some alternative reality Comedy Central. Here's a trailer for one of their programs.

Jet Lag: The Game https://www.youtube.com/channel/UCxkM67T_Iele-mRVUiBkRqg

Bonus: they're on Nebula too. https://nebula.tv/jetlag

If you're into cars at all, Drivetribe (founded by Jeremy Clarkson, Richard Hammond, and James May) posts a lot of content that Top Gear fans will enjoy. Very high production value.

I recommend Puppet History

It's a well-made comedy game show

Time Team are now on youtube.

Channels with some variety of content might include wired or insider.

This is verrry niche but Live from Moosejaw is what looks to be a YouTube comedy series that's just starting up about a long time local hockey broadcaster who gets saddled with a big city equivalent on his talk show. I enjoyed the teasers/setup they were showing before today's premiere episode https://youtube.com/@LivefromMooseJaw?si=BvgpECdEEltcKlY4

Good Mythical Morning scratches the itch for me on most days for this kind of content. Plus i just really enjoy Stevie's voice 🥰

Hangin' With Doctor Z. Dana Gould hosts a 70's style talk show while dressed up like Dr. Zaius from Planet of the Apes.

I highly recommend The Try Channel, https://www.youtube.com/channel/UCabq3No3wXbs6Ut-Pux6SzA/videos
They mostly "try" food but do a few other things as well. They are very funny. I watch this for the laughs and do learn things about the foods.
I really wish they were on Mastodon or Kbin.

Not on youtube, download PlutoTV app. Paramount’s old stuff, including game shows, Star Trek, Twilight Zone, lots of ‘60s and ‘70s shows, plus some documentary and DIY shows. All free and really easy to waste LOTS of time watching!

AntsCanada channel, and their Pantdora series.

Science and Futurism with Isaac Arthur

This channel focuses on exploring concepts in science with an emphasis on futurism and space exploration, along with a healthy dose of science fiction. While we explore many concepts and technologies that are far beyond us now, we try to keep everything inside the bounds of known science or major theories.

https://watch.plex.tv/live-tv

has tons of free tv-like channels with a slew of content. Plus you can self-host your own media on there for free too if you that’s your thing.

Dont hug me im scared

Big lez show

Kill tony

The Big Lez Show did. Go watch it right now, you will love it.

Watcher has a few shows that are produced and aired like TV shows.

Dropout has two game shows that are great. Game Changer, where the rules of the game change every episode, and Um, Actually; a kind of pop culture trivia game where your answer must begin with "Um, actually..." They tend to have guests well known from around the Internet like Adam Conover and Matt Mercer.

Not sure if your style, but maybe Cut? It's like reality TV from 2010's MTVs but for youtube.

More educational content seems to fit this such as:

Gaming Historian

PBS Spacetime