Recently, Nextcloud, IONOS, and a bunch of other European tech companies came together to launch a new open source project called "Euro-Office", described as a "sovereign replacement for Microsoft Office with intuitive interface and strong compatibility backed by European open source community. Now, ONLYOFFICE has suspended its 8-year-old partnership with Nextcloud, citing license violations after the Euro-Office coalition forked the ONLYOFFICE repo.

They [...] claimed that ONLYOFFICE discourages contributions, ignores pull requests, and lacks transparency, since commit messages frequently reference internal issue trackers only.

ONLYOFFICE is criticized by its open-source competitor LibreOffice for being fake open source. The software defautls to Microsoft Office formats.