Of course Microsoft et-al won't sit around with their disks in their hands watching their market cap get obliterated by Europeans moving to FOSS, so they'll wine and dine politicians, open an office here and there, offer generous kickbacks and discounts for volume purchases, bribe Ursula v.d. Leyen and have her delete her emails after doing deals under the table, you know, the usual EU drill, making the decisions to move to FOSS seem very expensive to the bean counters running the show compared to staying locked in to the Microsoft, Google, Apple, etc ecosystems, so I don't think such a transition will even happen EU wide besides a few small municipalities here and there.