[fouc]

If the author of this blog post reads this:

Based on your earlier article, you mentioned the issue of spam. Slack is even worse than IRC for spam controls, I've seen spammers be hugely disruptive when the admins aren't around. It could be partially solved with bots, but that doesn't stop PM spam.

I looked at the docs for mattermost, riot.im, and rocket.chat.

Seems like rocket.chat has the best docs and lots of fine-grained control about permissions and also has rate limiting. Mattermost also has rate limiting (but API level only?) but their docs are horrible. Riot.im doesn't seem to have any controls.

[Arathorn]

Matrix/Riot has a lot of anti-abuse stuff fwiw - https://matrix.org/docs/guides/moderation has more details, and we're about to launch a shared blacklist feature in addition.