alt Hacker NewsThey're allowed to do it "to the extent that they are strictly necessary and proportionate ... provided that such measures are duly justified".
It remains to be seen whether the EU decides that this measure is strictly necessary, proportionate and duly justified. They sometimes do the right thing but I'm not getting my hopes up.
EU will likely want something like this for ChatControl (or whatever it's called in its current draft iteration) enforcement anyway. And Google will no doubt be happy to have its highly paid lobbyists testify on how it will help catch child predators and terrorists.