What about an entire family of people who have no interest in learning technology they just want the shady ad-free youtube on their phone? I find it perplexing you've never met people like this. I'd wager it's more common than not in our world.
Look at apps on fdroid, no such thing.
So the solution is simple - ban google play and allow only fdroid if one wants good apps.
You can't protect everyone. Just like there are people oblivious to bad eating habits - it is a tax on ignorance.