You can't really deeply integrate any of Google's communication offerings aside from Gmail because they keep introducing and killing off new things so often. People weren't using that stuff in the first place. Zoom is one thing that offers one thing. I work in IT and I cannot tell you what Google's current messenger is called. Your grandma wouldn't find it. Zoom was there, had a catchy name and was easy to use. It had/has everything needed to completely dominate.