I’ve got a private, paid Slack team ($10 a month?) and you can invite people from other paid Slack teams to chat in rooms on it. Nice thing about this is it’s “

I’ve got a private, paid Slack team ($10 a month?) and you can invite people from other paid Slack teams to chat in rooms on it. Nice thing about this is it’s “by design”, so less likely to get shut down, and also unlikely to fall foul of computer misuse laws.