Mattermost (the company behind this) also builds spyware into Mattermost (which is not well documented) and I would be unsurprised to find the same nonsense going on with this.
Is there a term for companies that are "open source in license only" that ignore all of the values of the free software community?
If you download the app store version, and you edit the source code of the downloaded app to, say, scratch an itch, it will not run any longer because the app bundle signature verification will fail. Distributing unmodifiable applications defeats the whole purpose of a free software license.