There are a lot of people selling primary accounts on Facebook, it's safe? how they get those accounts?, when you ask for them the rules are:

- Don't login twice on account.

- Don't change any data on account (email or password).

- Don't buy or delete games on buyed account.

- After activation play ONLY on own account!

- Don't remove account or games (until you need game or account).

- In case of a refund, crypto currency is made in the same currency in which the payment was made

IDK how the do it, I read and search a lot, there's no way to duplicate a primary account, thinkin on Netflix accounts I search on DarkWeb but there's nothing there.