Some broadcasters do already have this feature. For example if you watch adult content (doesn’t have to be nudity, could be violent shows or other content that isnt considered appropriate for children) on SkyTV (UK satellite) then then you get promoted for a pin if its before 9pm.

The thing I referred to in my previous comment is more of a historical thing before smart TVs and similar tech. Current RF technology is still just an evolution of the same signals sent 70+ years ago. So they’d moderate content via scheduling. “Terrestrial TV” still works that way today.