LibreOffice blasts 'fake open source' OnlyOffice for working with Microsoft to lock users in

The Document Foundation (TDF), steward of LibreOffice, has publicly labeled OnlyOffice as 'fake open source,' accusing it of partnering with Microsoft to enforce vendor lock-in by defaulting to proprietary OOXML file formats rather than open standards like ODF. TDF draws a parallel to the browser wars era, arguing that ISO's recognition of OOXML as a standard was a mistake that has trapped users in Microsoft's ecosystem. OnlyOffice promotes its Microsoft Office format compatibility as a feature and operates a hybrid open-source/proprietary model.