It looks like Zoom started in 2013. Google Hangouts was only released in March 2017. When trying to use Hangouts I've had to jump through different browsers because the one I was using wasn't supported.
I also think accounts are a friction. Even though we all used Google services, with Zoom if I needed to hop onto my phone so I could listen in while running an errand I would have needed to authenticate if I was using Meet. I also don't think I've ever been in a Google video chat with more than 2 people. With Zoom we did company meetings without issue.
Maybe it was the friction around plugin deprecation (was it Firefox?) combined with the treadmill of deprecations and transitions to new products; within the past year or two I've had to jump between Safari, Firefox, and Chrome to join a meeting--also requiring a separate plugin install. Over many previous years Zoom worked just fine as a standalone app.
I also think accounts are a friction. Even though we all used Google services, with Zoom if I needed to hop onto my phone so I could listen in while running an errand I would have needed to authenticate if I was using Meet. I also don't think I've ever been in a Google video chat with more than 2 people. With Zoom we did company meetings without issue.