The only way to accomplish this at scale is to build something that is legit better and let the market decide. Anything else is just principled wishful thinking.
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.
Have you used Teams these days? If you think it's acceptable, I suggest that may be the Stockholm Syndrome kicking in.
And for all its many flaws it does have some advantages over Meet (which is what my company switched to it from):
* Remote control of other people's desktops (except on Linux unfortunately). Meet has no solution for that. Endless "no up a bit, left.. no you had it. Third one from the top. Here let me share my screen instead".
* Conversations you have in meetings don't disappear into the aether. In fact for recurring meetings it's even clever enough to use the same chat.
* You can directly call people. Meet requires you to create a meeting and then invite someone.
Ok that's all I've got. My list of complaints is much longer, but even so it just about makes it to acceptable.
Kind of crazy that Google hasn't just solved this though. Clone Slack, integrate it with Meet. Make a high performance desktop client (not web app) with remote control. They'd make a fortune.