Didn't GCP manage to lose from this position of strength? I'm not sure even if they're the third biggest
They've got the cash, the people, and the infrastructure to do things faster than the others going forward, which is a much bigger deal IMO than having millions more users right now. Most people still aren't using LLMs that often, switching is easy, and Google has the most obvious entry points with billion+ users with google.com, YouTube, gmail, chrome, android, etc.
Google can be good on the technological side of things, but we saw time and time again that, other than ads, Google is just not good at business.