Looks like you need a login to create a room, but not to join one.

Someone at some point in the past has created this one, for example:

https://appear.in/lolbutts

And you can join it as a guest.

Oh no! Used to be my favorite

The main reason I still use Google Meet is that appear.in has a full-fat P2P model where your video and audio must stream to every user and vice versa. Even with 4 people that can get pretty taxing on a poor connection.

Google does smarter muxing of video and audio streams and is better about throttling video quality to preserve bandwidth when required.