Do they limit forwarding? Or give users an option not to be shown forwarded messages?
For me, unlimited posts (or rather, minimal friction in posting), and blind forwarding are what destroy social media. If you can make only 3 public/group posts a day, chances are lower they will be crap.
I'm on Mastodon. It's only very mildly nice. The reality is that it still suffers from all of this. I still have to cut off connections because of the guy who's always ranting about some politician/political party.
Increase the friction for people who want to rant!