OnlyOffice is getting upset that they've been forked, after they attempted to set sketchy license additions to prevent forks:

https://www.onlyoffice.com/blog/2026/03/onlyoffice-flags-license-violations-in-euro-office-project-by-nextcloud-and-ionos

I explain their questionable license, including a conversation I had with their legal manager, on isitreallyfoss:

https://isitreallyfoss.com/projects/onlyoffice/

I hope Euro-Office succeeds to provide a FOSS-friendly alternative, will need a lot of effort though to continue a project like that, especially if OnlyOffice play nasty.