Embedded webviews were the easiest parental control bypass on Windows since about Windows 98. I've played so many flash games through the documentation for Microsoft Word!

I can't find any information anywhere that either confirms or denies the possibility to bypass Google's restrictions with web views. I assume it's possible, because it's possible on most platforms, but I suppose it depends on the implementation.

I've seen parental controls that employ an (on-device) MitM proxy and DNS filtering to ensure safety, and those apps will prevent almost any app from displaying unwanted content.

Normally they are fixed to one domain.

Right, but if I've banned youtube.com in parental controls, it'll still load in, say, a Mastodon client with an in-app browser for opening links?