There is also other people's servers like the Chaos Computer Club: https://jitsi.github.io/handbook/docs/community/community-instances/

I just checked and the authentication mechanism looks like it is enforced only in the enterprise version run by 8x8 (according to the blog it is 8x8 which will save authenticated users). Correct me if I am wrong.

There is also this to find a list of other instances (most likely hosted in France): https://www.chatons.org/search/by-service?service_type_target_id=117&field_alternatives_aux_services_target_id=All&field_software_target_id=All&field_is_shared_value=All&title=