This may not be 100% relevant to this thread, but I don't know where else it would belong.

I went on Hexbear recently in order to see what all of the fuss was about. (slrpnk.net defederates only a few instances, but hexbear.net is one of them.) I cursorily perused the Local feed and some of the more popular communities and was mildly surprised by the proportion of comments expressing solidarity, caring, encouragement, and so on. After that, I checked out the Code of Conduct to see whether such behaviour was exceptional or part of the Hexbear culture. Of course I didn't agree with everything that I read, but multiple times, I found myself saying "this is pretty reasonable" or "we should do that here." In particular:

We are committed to providing a friendly, safe and welcoming environment for all, regardless of gender identity and expression, sexual orientation, disability, personal appearance, body size, race, ethnicity, age, religion, nationality, or other similar characteristic.

Direct calls to violence that target specific identifiable living individuals are not permitted on Hexbear.net. You can express your anger over landlords, slaveowners, etc, but try to phrase it in a way that focuses on the institution they represent. This policy also applies to any specific organizational bodies and groups (eg the DNC).

Animal Liberation is essential to any leftist movement, including platforms like Hexbear. Volunteers, comments, and posts, should not be anti-vegan, although users and volunteers are not required to be vegan.

This last could be easily adapted to this instance: "Animal Liberation is essential to any anti-capitalist movement, including platforms like SLRPNK. Volunteers, comments, and posts, should not be anti-vegan, although users and volunteers are not required to be vegan."

Of course I was most interested in the vegan community, and it seemed pretty cool. The vegan community's rules are the following:

• No plant-based diet bullshit or promotion of plant-based capitalism. Veganism isn't about you, it's about historical materialist anti-speciesism, anti-racist animalization, and animal liberation. Ethical vegans only.
• No omni apologists or carnists. Babystepping is for libs, and we're not here to pat you on the back. Good faith questions and debate about how to fight for animal liberation are allowed.
• No advocating violence to any species for any reason. If you think this is negotiable GTFO. This includes but is not limited to animal testing, slaughter, and mass euthanasia. Anything that promotes speciesism or the commodification of animals will be removed.
• Use Content Warnings and NSFW tags for triggering content. Especially if a comrade requests it.
• Questions about diet belong in c/food. It's also a great place to share recipes.

If we wanted this to be a vegans-only community, then adapting these rules (basically by adjusting the wording rather than the meaning) would be a fairly solid starting point. Even if we wanted this place to be more open to the pre-vegans of the Fediverse, these rules would probably still be appropriate in some form.

Just sharing this in the hope that it will be useful but without any warranty (not even the implied warranty of merchantability or fitness for a particular purpose).