A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
It wouldn't be a TV itself, it would be an extra box you feed the TV signal into for filtering, then out to the TV itself.
This has been done previously for language filtering with hilarious results. It was called "TVGuardian", oh, almost 30 years ago now.
It translated "the Dick Van Dyke Show" to "Jerk Van Gay".
To be fair, Dick Van Dyke is ALREADY a hilarious name. Not even sure how that made it past 1950s censors who wouldn't let Ricky and Lucy sleep in the same bed, or Barbra Eden show her belly button.
Because it's his actual legal name. It's not some snarky name they created for the show.
Tell that to Johnny Felatio.
Unfortunately this does not financially benefit the tv manufacturers, and may land them in trouble with the platforms they themselves advertise on (like Google).
They're more likely to use AI to serve you more ads as an extra revenue stream; capitalism has gotta capital.