That's because teams was offered for fee with m365 which most companies used anyway.

Having said that, Zoom is an absolutely terrible product. The backdoor they installed in Macs for example and then when it was brought to light refused to remove it until Apple was forced to blacklist the application. They're either incompetent or evil.

Looking at the Linux version with their hard coded list of supported distros when trying to share your screen...

I'd say both.

Zoom was popular with at home schoolkids. Because to use Teams you had to have a Microsoft acccount first. Zoom was a link, a meeting ID, and password. Sometimes just a link.

I've actually never had to put a password in to any zoom call. It was always just the link. Only when calling from a phone did i have to put even the meeting ID in

You can optionally add the password as a query parameter to the zoom link itself. The links you got probably had that.

Jitsi and BBB were pretty popular across universities at the time, back when the German government were pivoting hard into Element/Matrix:

https://element.io/matrix-in-germany

Zoom is a thing in Germany.

In the US, I would say roughly everyone uses Zoom outside of companies using Teams or Meet, generally because they're bundled with the office suites they use.