Forking frenzy ensues after launch of Euro-Office
To recap, Nextcloud released in January 2020, using OnlyOffice as its default integrated online office suite. 'Strong compatibility' Translation 1: It defaults to Microsoft file formats.
Threads
Specifically, in section 7, headed Additional Terms, the AGPL3 says: "Additional permissions" are terms that supplement the terms of this License by making exceptions from one or more of its conditions.The Register