Did you read the Github issue? These guys are paying customers.
> What This Means for Existing Deployments
> Paid Customers: No action required—your deployments are unaffected.
[1] https://forum.mattermost.com/t/mattermost-v11-changes-in-fre...
> Mattermost Entry gives small, forward-leaning teams a free self-hosted Intelligent Mission Environment to get started on improving their mission-critical secure collaborative workflows. Entry has all features of Enterprise Advanced with the following server-wide limitations and omissions:
https://docs.mattermost.com/product-overview/editions-and-of...
Sounds like some kind of parody of enterprise software.
I saw "we're happy to pay for it" and thought they were paying for it. They're not, yet.