Question is, what's it doing when you use client software that doesn't support the spammy popups? It appears that for a third party client user, it auto-injected URLs the sender didn't expect or even see. So someone creating a Zoom invite had no idea their coworkers might see a Meet link.

Also, Google could/should recognize that a meeting invite with a competitor's room URL in it is somewhere it shouldn't inject its own. Especially since it opens up yet another avenue for an open and shut anticompetitive case against them.