As the other comment said, it’s less used than Matrix, but it’s moreso I’ve heard that XMPP, unlike Matrix, doesn’t really have their own official chatrooms directly managed by XMPP Standards Foundation.
Whether that’s true or not, I’m not quite sure, I still need to do some exploring with XMPP and see for myself, but that being the case alone would prevent a situation like with Matrix where this kind of content is being posted under their direct supervision.
Again, I’m reiterating just to make sure I’m being clear, but it’s not an issue for me if there’s going to be CSAM on the protocol or even on an official server for it, but I’d be uncomfortable using a protocol if that kind of content was being posted and not properly dealt with in official chatrooms.
Feel free to disagree, but it’s a bit of a moral thing for me as to whether I’d be comfortable utilizing tools developed by a group with issues like this.
As said in another comment, I’m already on a separate server, that being tchncs. I just personally wouldn’t like to see my usage of the protocol possibly being seen as me being content or indifferent to these heavy moderation issues in their official rooms.