I think if I were any non-US government I'd be very seriously thinking about not using Microsoft software at this time, particularly if it connects to the cloud. And that goes for companies with government contracts, or merely companies who are potential targets of industrial espionage.
That said, LibreOffice needs to tap the EU for funding to broaden its features and also improve the UX because it's not great tbh. It can be extremely frustrating using LibreOffice after using MS Office, in part because the UI is so different, noisy with esoteric actions, and very unrefined compared to its MS counterpart. That needs funding and to get to the point that somebody can pick up LibreOffice for the first time and not be surprised or stuck by the way it behaves.