@je5perl I should email those people om that letter, because currently EU framework + country law does not support ESPs reporting CSAM, especially not smaller ESPs like Mastodon server admins.
When I directly asked the german authority responsible for protecting children about how to report CSAM as a small ESP, I was told "don't bother, delete it and pretend it didn't happen, because possession in Germany is strictly illegal even for reporting this content to law enforcement. If BKA contact you then comply, but otherwise don't proactively report abuse & illegal activity"
Chat Control as far as I know still doesn't provide ESP safe harbour, nor an EU wide reporting API/service for ESPs (ala NCMEC), nor the establishment of hash databases for known illegal content.