A few have, but it’s been brought up before

Some don’t want to because it’s a “flagship” instance and ther fore has many old comms on it (But on that note, it’s only by subscriber count, which never goes down unless a user actually unsubscribes from a comm, so .ml memes might have 50k subscribers, but the absolute vast majority of that is gonna be dead, deleted and maybe even alt accounts, if we go by Monthly Active User metrics like off of lemmyverse.net you’ll see that very very few .ml comms still beat their non-ml equivalent.)

Some don’t because of fear of retribution from dessalines or at the very least “slow walking” of any issues that might come up, not likely to happen with smaller instances. But if you’re as big as say .world, then that could be a potentially huge problem and would be the exact kind of instance dessalines would choose to flex this retribution on as a message.

Some don’t because they prefer to have their users decide for themselves (e.g. dbzer0.com) or have an alternative such as lemmy.zip’s default block which block the whole triad for new users. Which is fair, there should be instances on the Threadiverse that are unfiltered for uh “Politically thick skinned users” but they should not be put forth to prospective users from Threadiverse advocates looking to bring users from reddit.

And then there are some that do, infosec.pub and Lemmy.cafe are the 2 that come to mind, but I’m sure there are more