The Greens in the European Parliament have published a paper on ‘European Tech Sovereignty Policy’ with many sensible proposals:
extranet.greens-efa-service.eu…

But when it comes to software, we should offer a better response than protectionism. And that better response is open source.

The European Greens are calling for “the development of a full European digital stack”. I hope they don’t mean it quite as it’s written there. We don’t need to develop the software all over again. From the Commission down to local authorities, should simply stop paying for licences.
The approach proposed is expensive and complicated: “… non-European providers should be…, subject to a formal justification process”. That sounds like pointless bureaucracy. It is complicated for the purchaser to verify a provider’s exact ownership structure. And it is pointless, because a European provider could be sold next week.
In contrast, it is simple to require the provider to ensure that all software supplied must be open-source.