Even with a more restrictive approach Google/YouTube could whitelist specific content providers, which could provide fresh content on a frequent schedule.
Sure, it will start shifting once they want to watch something their peers watch. But at the time parents choose the media, how would they even know it's not the latest production, or some mix of old/new?
Peppa pig started in 2004. At the time kids are interested in it, if you show them ep 2, will they say "this is not from series 6 from 2019"?
I'd be surprised if there weren't a bunch of kids who really wanted to see content from the latest Minecraft update.
I was about to suggest that content creators pay a nominal fee for the content to be reviewed but if creators have no way to monetize the platform, that proposal is bijective with suggesting that Google just shut down YTKids. Or are parents paying already for access to YTKids and the reviews would come out of that?
The argument here is whether imperfect curation is better than none, and the history of television tells us that it is. We never had a TV channel that randomly showed kids pro-suicide messages.