From the Electronic Frontier Foundation, regarding a new bill that is about to pass in California that mandates everyone ID online (not just age attestation, but like a literal biometric ID on many if not most sites you access):

"By banning access to social media platforms for young people under 16, California is emulating Australia, where early results show exactly what EFF and other critics predicted: overblocking by platforms, leaving youth without support and even adults barred from access, major spikes in VPN use and other workarounds ranging from clever to desperate,"

And the disturbing part I'd like to comment on:

"and smaller platforms shutting down rather than attempting costly compliance with these sweeping bills."

Yea, or they just flat out leave California. There is this thing called jurisdiction and companies that don't operate in California are generally not subject to California law. Particularly laws that don't have equivalents elsewhere (in the extraditing jurisdiction). In other words Canada isn't going to extradite someone from Canada to the US for picking their nose and posting about it online when the US bans it because it's only illegal in the one country. This isn't always the case- but it's usually the case (the US and UK have a one-way thing going where the UK extradites to the US, but not vice versa humorously because the US didn't hold up their part of the deal after signing some treaty recently, but the UK did).

Can we all say it: California, go fuck yourself.

I'll add one more comment, so a company might become subject to California law if they market to those in CA more explicitly or ship their own property into CA (rent DVDs) or pay contractors to fix PCs of customers in California,

https://eff.org/effector/