There’s no reason why activitypub would be considered any different from email, nntp, or even search engines and internet archives. When an website or email server gets a GDPR request it’s not propagated in any way, and it would be a stretch to expect it to.

From what I understand it would work as other parental controls like on streaming services - i.e. parents of minors would configure the browser so it cannot open “inappropriate” content. The information wouldn’t need to leave the device ever.

Pornhub is proposing something that would be enforced on the browser/operating system level, and then the service providers would only need to specify the minimum age for a certain resource. While there are obvious limitations with this approach, it would work much better than the current approaches for distributed services.

Little to do except for the part where admins just banned a bunch of people for criticizing the Chinese government.

For modern lithium batteries, that is even harmful for the battery.