I would venture that the problem with Google's products is that they run in the browser and in spite of all the improvements in browsers these days its just not ready yet when you need the kind of quality and performance that huge meetings demand.

Also and perhaps more importantly, Google's approach is tied into its own ecosystem but anybody can join a Zoom meeting with just a link/code. Google had everything they needed but are too tied into the everything on the browser mindset and their own ecosystem to see they're shooting themselves in the foot before their horse is even out the door. At this point its too late, Zoom's aggressive pre-marketing, simplicity, and ubiquity is a real force now and everyone else is just playing catch up.