Not a good look for Mastodon - what can be done to automate the removal of CSAM?
Nothing you can do except go after server owners like usual. Has nothing to do with the fedi. Mastodon has nothing to do with either because anyone can pop up their own alternative server. This is one of many protocols they have or will use to distribute this stuff.
This just in: criminals are using the TCP protocol to distribute CP!!! What can the internet do to stop this? Oh yeah, go after server owners and groups like usual.
Things are a bit complicated in the fediverse. Sure, your instance might not host any pedo community, but if a user on your instance subscribe/interact with those community, the CSAMs might get federated into your instance without you noticing. There are tools to help you combat this, but as an instance owner you can’t just assume it’s not your problem if some other instance host pedo stuff.
That is definitely alarming, and a downside of the fedi, but seems like a necessary evil. Unfortunately admins and mods of small communties in the fedi will be the ones exposed to this. There has been better methods if handling this though. There are shared block lists out there and they already have lists that block out undesirable stuff like that, so it at least minimizes the amount of innocent eyes of mods, who are just regular unpaid people, from seeing disgusting stuff. Also, obviously those instances should be reported to the police, fbi, or whatever the heck
There is a database of known files of CSAM and their hashes, mastodon could implement a filter for those at the posting interaction and when federating content
Shadow banning those users would be nice too