http://fdroidorg6cooksyluodepej4erfctzk7rrjpjbbr6wx24jh3lqyfwyd.onion/fr/2022/02/28/no-user-accounts-by-design.html
This is a common way to implement such a system, but
it is not the only way. Tor Onion Services opens up a different approach. They are designed for routing data without any
part of the system being able to see who is sending data to whom, and who is
making the request.