Why everyone can kick everyone? What´s the point? :)

What is the utility about allowing any user kick another any user? It´s pointless.

That should be just a administrator function.

Citing from this post :

The public meet.jit.si service, by design, makes all users moderators and makes a few other changes to configuration settings to meet their goals for that service.

If you don’t like those options, then you are free to run your own server/service, in which case the first user in will be the moderator, you can have user authentication tokens, etc.