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Somehow I think the stars might be aligning this time though> governments around the world are loudly thinking about how to reduce dependence on US tech
I am definitely sympathetic, after all, I worked for a major Linux company for quite a few years, started using Linux RH) in 1994, and even wrote some network related kernel modules.
However, this switch to Linux is not going to happen (apart from where it is already used heavily, from servers to many non-PC systems).
I have been in projects for large companies but also government on and off. Now, I manage the IT of a small (People who actually comment in these discussions seem to be entirely focused on the OS itself. But that is what matters the least in business. Office is another, and even there most people who don't deal with it at scale are way too focused on some use case where individuals write documents and do some spreadsheeting. It's almost always about a very small setup, or even just a single PC.
However, the Microsoft stack is sooooo much more. ID management. Device management. Uncountable number of little helpers in form of software and scripts that you cannot port to a Linux based stack without significant effort. Entire mail domains are managed by Office 265 - you own the domain and the DNS records, you get licenses for Office365 from MS, you point the DNS records to Microsoft, you are done.
Sure, MS tools and the various admin websites are a mess, duplicating many things, making others hard to find. But nobody in the world would be able to provide soooo much stuff while doing a better job. The truth is, they keep continuously innovating and I can see it, little things just conveniently showing up, like that I now have a Teams button to create an AI script of my conversations, or that if more than one person opens an Office document that is stored in OneDrive we can see each other inside the document, cursor positions, and who has it open.
Nobody in their right mind will switch their entir4e org to Linux unless they have some really good reasons, a lot of resources to spare, and a lot of experience. Most businesses, for whom IT is not the be-all-end-all but just a tool will not switch.
But something can be done.
The EU could, for example, start requiring other stacks for new special cases. They cannot tell the whole economy to switch, not even a fraction of it, but they could start with new government software. Maybe - depends on how it has to fit into the existing mostly Microsoft infrastructure.
They could also require more apps to be web-only. I once wrote some code for some government agency to manage business registrations, and it was web software.
The focus would have to be to start creating strong niches for local business to start making money using other stacks, and to take the long road, slowly replace US based stacks over the next two or three decades. At the same time, enact policies that let local business grow using alternative stacks, providing a safe cache-flow that does not have to compete with US based ones.
The EU also needs some better scaling. The nice thing about the MS stack is that I can use it everywhere, in almost all countries. The alternative cannot be that a business would have to use a different local company in each country.
I read a month ago that EU travel to the US is down - by only ~3%. Just like with any calls for boycott of this and that, the truth is that those commenting are a very tiny fraction. The vast majority of people and businesses are not commenting in these threads (or at all), and their focus is on their own business and domain problems first of all. Switching their IT stack will only done by force, if the US were to do something really drastic that crashes some targeted countries Microsoft- and Cloud-IT.