I am not certain I can explain it, but for one thing they have defederated from two of the largest instances including Lemmy.World, bc they wanted a narrower range of experiences yet the mod tools would not allow them to keep up with vetting the flood of content from them and thus their userbase would have been "exposed" to it.

The mantra is "be nice", but I also saw people discussing literally murder of "others" who they disagreed with, like they voted the wrong way, or didn't vote despite being in a deep blue USA state or something. So I have no idea of what the criteria really is.

In any case, people report being banned from there at the drop of a hat, bc their mods are quite zealous. Which can be quite shocking to someone coming from a place that has significantly looser moderation practices.

So anyway the label I see for a post hosted on a Beehaw community says:

This post is hosted on beehaw.org which has higher standards of behaviour than most places. Be nice.

And then that link goes to Beehaw's own description of their own policies. I love this approach! It's quite friendly - it allows Beehaw to speak for itself, and rather than penalize the instance for being different, yet it addresses the interface between it vs. the wider Fediverse that is more used to content such as appears on Lemmy.World, which again has significantly looser standards (due in large part to severe lack of moderation efforts, which in turn relates to lack of development of tools that mods seem to consider sufficient).