A lot of business customers bundle their business/productivity software with their phone and Internet services. Did you know you can buy Google Workspace and/or Microsoft Office through your telco? I was shocked to find out how many do this when I worked for one of the telcos.
Just like how consumers bundle their streaming services with their home Internet plans.
One bill for all the things is convenient.
I would bet it's the same in EU (but can't say for sure, I only have first-hand info about Canada).
If there was a real push to move companies away from these platforms, it would probably start there, mostly because the telcos are typically very government-aligned due to regulatory and spectrum concerns, and would get in line with government efforts to promote non-US alternatives, if they decided to.
Getting the majority of consumers to ditch their US-based streaming and entertainment is another thing though, I can't see that happening ever, no matter how at-odds the US and Canada become.