Worker coops have their own procedures. I suppose pretty much the same as any other workplace, but with other workers having more say on who is hired.
With consumer coops like credit unions, theres less interaction with other members so having assholes is less of a problem.
But people who take care of their finances cannot basically be kicked out of consumer coops afaik, so in that sense theres no safeguards against assholes joining.
social.coop is a cooperatively-run corner of the Fediverse. The instance is democratically governed by its members, who generally share an interest in the co-op model, but topics of discussion range widely.
Our instance is supported by sliding scale contributions of $1-10/mo made via Open Collective. You must have an active Open Collective account to apply for membership; you may set one up here