While Jitsi is open-source, most people use the platform they provide, meet.jit.si, for immediate conference calls. They have now introduced a “Know Your Customer” policy and require at least one of the attendees to log in with a Facebook, Github (Microsoft), or Google account.
One option to avoid this is to self-host, but then you’ll be identifiable via your domain and have to maintain a server.
As a true alternative to Jitsi, there’s jami.net. It is a decentralized conference app, free open-source, and account creation is optional. It’s available for all major platforms (Mac, Windows, Linux, iOS, Android), including on F-Droid.
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It’s not the only reason to use jitsi, just that most people wouldn’t bother seeking any alternative if they didn’t care.
“Main motivating factor” != “Only viable reason”
Sorry for any unclarity I introduced. And yes, login via google vs full on google meet are two different things, but if I have to login via google for Jitsi I’m suddenly far more likely to use Jami