Hi, Jason.
I am fairly new to Mattermost but as far as I am concerned, it does not provide a specific scaling guide that mention the following:
- Maximum team size (number of members per team)
- Maximum number of teams (number of teams per deployment)
Like any other server / behind the firewall communication tool, it depends on the resources provided to the server in general. However, I came across the following thread that might provide a good explanation to this:
Team Edition - Max number of users supported on typical Team Edition deployment
Hope that helps to at least provide a better explanation to this.