lemmy.ml is run by the devs, one of whom is dessalines. He talks about it in general for example in this issue, and again in general in Lemmy’s ideal Code of Conduct here (I say ideal because it’s what they want, but instances are free to do whatever they want to, at risk of defederation)

I’m sure there are lots of other places they talk about this, but they seem to see it as an integral part of Lemmy, so perhaps there is no specific announcement post. You can join a different instance and you will see a lot less of removed.