Isn't this just Pluto TV? Like, https://pluto.tv/us/live-tv/633354b63df9700007f6a1b7 is the sitcom channel, https://pluto.tv/us/live-tv/66ba495ffe11e5000881f049/details is the channel of just Cheers and Frasier, etc. Just playing non-stop through one episode after another on a schedule as quasi-"live" TV.

That is exactly what I imagined! However, I would prefer a service I already use, free of commercials.

Definitely going to consider using this.