Institutionally at least, anything goes - including the worst CSAM.
Perhaps this is an exceedingly poor way to describe it - I just meant that federation (like with ML, hexbear, lemmygrad, and any new instance) happens by default. Instances that host CSAM - like extremist far-right content - are quickly defederated from by the rest of the Threadiverse, but such requires effort on behalf of the instance admin. I thought, though perhaps I am wrong.
Anyway it could still be misleading even if correct, bc this is at the instance level, whereas someone still has to subscribe at the community level in order for content to begin coming in. So the potential for content - good, bad, or whatever - to spread is baked right into the ActivityPub Protocol from the start, by design. Just like what people keep saying about 4chan (though admittedly I never went there personally).
And people must have subscribed to hexbear and lemmygrad and ML communities on all of the major instances, therefore all of that content was already there for me to stumble upon as a new joiner myself, fresh from KBin where it had been severely curtailed. I - like all other new joiners - then bad a decision whether to flee this place permanently (which I almost did, and continue to revisit that thought every year or so as expectations keep not being met, making it all the harder to hold out much hope for the future) or to begin blocking people, one by one, and even making a (successful) petition to defederate discuss.online from hexbear.net.
All of which is a lot of effort, especially since it must continue to happen with each fresh new alt made to subvert bans. Each new joiner must then be subjected this again and again, like a hazing ritual that we who have been through such already now offer little to no help to new joiners to avoid. Except for your codeberg request that will help to change that - hooray!
Ultimately, it’s arguably fine for places like 4chan and nostr to exist (unless you take the position that the echo chamber then breeds toxic trolls that when they leave it, act to harm others, though keep in mind that in this analogy, the Threadiverse itself is 4chan and nostr, in that we allow anything and everything, especially on ML that we then host on all of our machines too - e.g. if ML were to ever go down, that content would continue to remain, foreve, just like happened with Lemm.ee), but what’s far less fine is to allow people to stumble upon it unawares, particularly when it is labeled oppositely from what it truly is. A place’s reputation should proceed it, not be entirely ignored and force each new joiner to discover it all over again on their own, as what happens with ML.