https://matrix.org/blog/2020/10/19/combating-abuse-in-matrix... is our attempt at Matrix to spell out what a catastrophic idea it is to backdoor end-to-end encryption (and to provide an alternative proposal in the form of using decentralised reputation to mitigate abuse. We're kicking decentralised reputation work off in earnest tomorrow, so watch this space to see how it goes). I guess we'll be weighing in on the EU…
This proposal seems to address general abuse, spam, propaganda, filter bubbles, and so on. While these are worthy issues to tackle, the authors of the 7-eyes statement are not really interested in them.
What they say they want is for terrorism and child pornography to be detectable or meaningfully reduced. Do you think a relative reputation system will solve that problem?