Literally adding Google Meet URLs to Zoom meeting invites in Google Calendar, so half of a meeting's members went to the wrong room is kinda a bad way to scale your product: https://mspoweruser.com/googles-latest-audacious-growth-hack...
I tested on a new account and the default was on, which you might argue is bad, but when I tried to create my first calendar event there was a popup that told me that it was on and gave me the option to turn it off.
Plus when you create a event the option to include a Google Meet is right there and it's one click to remove.
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.
You could argue that, yes. And I won't blame you. But if you ignore Google and Meet for a moment and consider Microsoft (or in an alternate universe - Apple); product wise, this is a good decision. Reduces friction from creating meetings and provides a better experience.
You can disable automated Meet meeting generation though.