You can pay for hosted Zulip, so if “paying for it” is a distinguishing factor that’s not a point against it. I’ve also seen orgs that used on-prem solutions f

You can pay for hosted Zulip, so if “paying for it” is a distinguishing factor that’s not a point against it. I’ve also seen orgs that used on-prem solutions for compliance reasons and had an actual working service - it’s just not significantly cheaper when done right.