The U.K. Parliament is pushing ahead with a sprawling internet regulation bill that will, among other things, undermine the privacy of people around the world. The Online Safety Bill, now at the final stage before passage in the House of Lords, gives the British government the ability to force backd...
If they force messengers to implement backdoors into the protocol, I doubt they will limit it to UK users. Also, conversations with UK users won't be private anymore even if the other party is from another country.
Client-side scanning might not be enforced for other accounts but when the infrastructure is there other governments will want to use it, too.
That definitely won't happen. Full E2EE apps like Signal, iMessage, and WhatsApp aren't going to risk the worldwide backlash that would come with implementing backdoor access. The UK market isn't that big and definitely not worth it, they'd pull out of the UK entirely first.
I hope they will. My guess is that a nonprofit like Signal will pull out. They have nothing to gain and a reputation to lose. The others will probably comply by implementing some form of client-side scanning.