Don't think that European politicians are not corrupt. Who is going to pay a politician to use open source or local services from a small company? Who is paying politicians to use Microsoft?

When a decision makes no economic, legal, nor security sense just follow the money.

I can never find it again but there was a topic on HN a few months ago about exactly this - some government entity switched away from Microsoft, and then got a bunch of bribes and switched back. And there was discussion about how this is very normal and everyone sees this happening in their organisation too.