The one I started is https://kbin.social/m/kratom

I can't really find anyone on fediverse actively discussing kratom. It seems slow going for all the communities regardless of rules.

I would like a place to discuss vendors... but I do not know how all these fediverse admins will react to this. I would be interested to observe other situations to see what happens. For now it's all pretty freewheeling but I don't think that's gonna last. Since kratom in general is so low-interest I don't think we're gonna be the ones to test it.