For context my country (France) is trying to pass a law that forbids the use of social networks to users younger than 15yo. So I suppose this move from Discord is partly due to that.

Now that being said I would hope the verification process will have much more scrutiny in Europe than it would in the US.

I would definitely not be happy about it but if they are not allowed to keep any of the verification data afterwards it could be "acceptable". But if I have the feeling they keep any data I will actively look into building a Stoat instance and try the even harder task of convincing my friends to switch over.