The worst case is when only approved hardware and software will be legal, and every level of infrastructure will be enforcing that. You can say good bye to decentralized solutions then.

Note how Apple is already a bit like that, banning certain torrenting apps even from alternative app stores [0]. I’m just mentioning that as a demonstration of the feasibility of such closed and controlled ecosystems. Now restrict ISP network traffic to packets signed by approved hardware, and there aren’t that many practical loopholes left.

[0] https://news.ycombinator.com/item?id=45098411

Brazil's senate has already approved a bill, PL 2628, which is broadly similar to the UK's Online Safety Act, but also requires sistemas operacionais de terminais ("terminal operating systems") to implement age checks in a secure, auditable fashion.

The days where you could run whatever OS you want on hardware you own will soon be over. And you know what? There's not a damn thing any of us can do, so may as well just buy Apple gear.