Products don't necessarily win on merit.
Microsoft Teams "won" entirely because it was given away free with Office. Even though it is acceptable these days, it was horrible when it started. There is no way it could have won without unlimited backing from a bigger force.
You have to see EU trying these things in the same light.
Sure, Betamax was technically superior to VHS. But in the end the market still decides… nobody said “better” means technically superior… just something people want to use an other options available to them. “Good enough” with attractive value to the individual/business typically wins.
I have made most of my karma off of trashing Teams, and while it is "better" than it was before (I rarely get infinite loops crashing my browser now), it is hard to call it acceptable.
Yesterday I was supposed to have a call. I have the app open and it never once let me know that there was a meeting. The entire purpose is supposed to be collaboration with other people; if they aren't going to notify me on the web app, what's the point?
I know a lot of it is because of their need to support an infinite number of potential configurations, but if it had been a protocol instead of an app, we would have had the perfect frontend by now. (But then, how would they be stealing all of my data?)
I have also seen situations where sales opted into Microsoft early on. When they grew in relation to engineering forced the rest of the company to standardize to Microsoft products so they could get better rates and “save money”.
The EU can also ban access to US products, once EU alternatives are available, for example. "National security" or whatever PR is needed to make the case.
I'm unsure the EU could build and require anything worse than Teams, considering the open source landscape for that product category, for example. The primitives exist, scale them up and lock out US companies from the EU market with policy. Recycle the capital internally, just like VC funds do with their portfolio companies.
It wasn't seen as a priority national security measure before.
Now we have a US leader who may wake up tomorrow and put 100% tariffs on cloud services to EU corps or have the NSA demand chat logs.
> Even though it is acceptable these days
Have you used Teams these days? If you think it's acceptable, I suggest that may be the Stockholm Syndrome kicking in.