From my understanding, most European governments purchase American or other foreign-owned software, which often does not contribute to tax revenues in the countries where it is used.
The open-source project Grist Core (https://github.com/gristlabs/grist-core) is developed in the United States, with contributions from some French gov tech team.
From my understanding, all features are not open source, for example organization management aren't open-source, which limits its adoption in large institution …
https://react-spectrum.adobe.com/react-aria is used in most La Suite projects. Also we have one frontend developer focused on accessibility and few auditors. We always prioritize accessibility