Indeed, it is a rather simple algorithm [1] But you can set any name you like, either in the input field or directly in the URL. Protected rooms, where the participants need to know a common secret, are planned to be added to the project, see [2]
> Math.random() does not provide cryptographically secure random numbers. Do not use them for anything related to security. Use the Web Crypto API instead, and more precisely the window.crypto.getRandomValues() method.
Also, even if you had a CSPRNG there, your URL format seems to encode only about 27 bits of data.
Have you also seen apprtc [0]? Could you point out if there are any differences you see there to Briefing?
[0] https://appr.tc/