I was just pointing out that it wouldn’t be easily provable that you were in possession of such content.
Yeah, but I'd rather not have anything illegal than just making it less obvious. I'd rather stick to the rules.
unless you are saying that all forms of messages, including media like images and videos, are encrypted in e2ee rooms, in which case that is information I did not have.
Yes, media would be encrypted as well. Metadata is not, though. Matrix leads to quite a lot of that, unfortunately, due to the way it works.
There are usually many servers that know name and members of a chat, even though the contents are encrypted.
EDIT: I've been deep into hosting Matrix and XMPP for a long time, I sometimes forget which things aren't obvious from a user's point of view.