In a lot of corporate environments, "self-hosted" is not an advantage if you're the one trying to set up something new. In order to self-host, you have to go th

In a lot of corporate environments, "self-hosted" is not an advantage if you're the one trying to set up something new. In order to self-host, you have to go through your corporate IT department to provision servers. This alone can take 6 or 12 months, and you still have to find someone to maintain the service. And the kind of companies that value self-hosting will usually want this to be set up inside the company's internal network. So you'll have a bunch of firewall issues to get through, otherwise good luck getting your users to connect to some non-publicly-accessible server from their phones. Other comments talk about how Slack nailed the UX for users to join a Slack workspace. But they also nailed the UX for getting a workspace set up in the first place. (Well ok the whole idea of separate accounts per workspace thing is a bit of a mess, but they nailed everything else)