Isn't it counterproductive for every European country with a bit of extra money to develop its own open source software stack?

Don't the stakeholders perceive this as a problem, too?

Or is it inevitable, given how differently these bureaucracies are structured?

Oh sorry that is what I meant i would like this to be a EU wide ecosystem working together.

I’m hardly an expert, quite the opposite, but I imagine coordinating all those groups across multiple countries that don’t have a unified bureaucratic system would undo any disadvantages of just working on them independently and open sourcing at all. In theory they could all start borrowing from each other eventually.