Oh the laws are completely unenforceable, they’re basically just a blank check to go after any website the ruling class dislikes.

The article names multiple sites that have already shut down due to the UKs law

Eugen issued a statement that Mastodon is physically incapable of implementing age verification and that thedecentralized nature of the fediverse means there is no central authority that can block regions which define these laws.

https://techcrunch.com/2025/08/29/mastodon-says-it-doesnt-have-the-means-to-comply-with-age-verification-laws/

IANAL, but I imagine under the laws, they would go after individual instance owners to mandate verification. The laws have no provision for third party software, so it would fall to the courts, but most instances don’t have the funds to fight it.