I also see no good reason why Zoom would want to restrict this. Likewise, I don't see them dropping support for Safari either (works fine as well).
Maybe they limit things on mobile? But on IOS they'd be stuck having to support the Safari browser engine anyway as neither the Chrome nor Firefox browser engines are used on that platform (both browser delegate to Apple's browser engine there).
So they're effectively just blocking non-Chrome Android. Not sure if that's all they intended to block or simply all they're succeeding at blocking.
Do you have any Firefox extensions installed?
If you test in Chrome, does the zoom.us/test page connect to a meeting in the browser or does it open the Zoom app?
"You need MS-Windows to access the portal and reach your health dept pages"
"You need Android and a contract with Google to run the "app" and obtain certification from the State"
"You need a bank card in order to obtain the service"
...
No, Never. No, Never. No, Never. ...