Jitsi meet is not end-to-end encrypted [1]. Rather, it is encrypted with TLS between the client and the server, which doesn’t provide the same security/privacy benefit at all.
The website says it’s “fully encrypted,” which I think is misleading.
[1] https://github.com/jitsi/jitsi-meet/blob/master/README.md#se...
Edit: WebRTC does not support end-to-end encryption for multiple peers. This means it’s impossible for any browser-supported videoconferencing platform to support e2e encryption, including Zoom and Jitsi. This is where Jitsi actually has a unique advantage - it can be self hosted, which offers the same security benefits as e2e encryption.