Step 1: all the tech companies should stop using Windows (and MacOS for that matter). They whine about MS but still use their products. So use Linux, use LibreOffice, use EU based email or roll your own, develop software on open standards, etc...
Look at what the non-MS (and non-Apple) FAANGs do; they use OSS operating systems, tech stacks and build their whole infrastructure on open tech and standards, apart from a few proprietary bits rolled in-house.
EU tech's problem is that they all try to be MS but aren't. None of them seem to model what they do on the successful non-MS/Apple big tech companies.