Is it possible to limit the number of accounts per person with free registration?

Question

Algorithms

Given:
a hypothetical service in which anyone can register.
Requirements:
Ideally, in some way automatically limit to one account per person.
Not necessarily strict, just enough to match statistically (so that you can't specifically create yourself over 9000 accounts).
Preferably without the use of government/commercial identifiers (passports, phone numbers, etc.).
Is it possible, at least theoretically? (Well, or vice versa - "at least in practice?") I
will formulate it differently: anonymous registration is needed, but at the same time with a limit on the number of accounts per person.

Answer 1

Depends on the task.
If you need to close yourself from completely stupid bots, you can add captcha to registration. (does not save from smart bots)
If something is more cunning, it is necessary to indicate and check an identifier during registration, the mass receipt of which is difficult, for example, a phone number.
It must be understood that this still does not give a 100% guarantee, for those who really need to find 5-10 phone numbers available.
Only offline passport validation gives a 100% guarantee.

Answer 2

+
— регистрировать через аккауты соцсетей;
— предложить верифицировать аккаунт банковской картой через оплату и возврат $1;
— проверять слепок браузера и машины: valve.github.io/fingerprintjs2/;