I wonder if this is kosher:

https://github.com/Euro-Office/core/commit/e452acebeb3433895...

On the one hand, the authors of AGPL certainly didn't intend the "Additional Terms" to be a means to restrict forking. On the other hand, Ascensio System SIA apparently wants to restrict forking, and flouting this is asking for legal trouble (especially since Euro-Office appears to be a major thing).