That’s not an issue, IP addresses allow localization to some degree

The Californian law only affects California.

Individual OS vendors might decide to implement it in a way that affects other places as well, e.g. in the past, Valve decided they’d rather not implement age verification for Germany and just stopped selling all porn / super violent games in Germany. Maybe they’ll now implement it for Germany and California.

And Germany.

That’s what their actions felt like for decades yet somehow they’ve always kept chugging along.