If the EU is so concerned about cyber security they should:
1) provide A LOT of funding and support for Linux / BSD and other operating systems and flavors for testing, hardening, and rapid patch rollout
2) provide infrastructure to support such activities
3) use open source software actively in government with a focus on providing feedback and patches from government IT back to the mainline projects
A founding tenet of security is that open systems and techniques are the ones that will be most battle tested and therefore resilient.
Alas open source has terrible lobbying, so the closed source vendors can lobby politicians and policy to go the opposite way: prescribe closed source solutions and additional onus on open source.
If first world economies were serious about cyberdefense and hardening, there would be 10 billion dollars annually invested into the foundations of open source software: Linux/BSD, databases, webservers, browsers, programming languages, etc. The militaries alone should be dedicating this level of funding to defend our infrastructure, economies, and whatever technological edge we have over China.
And the EU in particular should like Linux: it originated there, and has strong roots throughout the EU, and most importantly isn't controlled by a major US corporation (unlike Apple/Microsoft) and therefore indirectly controlled by the US government.