This report from a Danish 'government expert group' might be of interest to some of you: https://www.english.digmin.dk/Media/638736628110392217/The%20role%20of%20big%20tech%20as%20digital%20infrastructure.pdf "The role of BigTech as digital infrastructure".

This is quite interesting: https://en.wikipedia.org/wiki/Adoption_of_free_and_open-source_software_by_public_institutions - about the Schleswig-Holstein migration from Microsoft to libre (open source) software. No figures that I caught, but full respect to the German presenters presenting in English!