Allo there,
In order to remove an account you need to authenticate each account. If you don't have access to an account then Bungie can't remove it for you and they also don't have access to your accounts or any account.
https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide
[quote]Unknown Linked Accounts
Bungie will not remove unauthorized Cross Save links from Bungie.net profiles. Players are recommended to not share their account details with anyone and to set up 2-step authentication on their platform accounts to prevent unauthorized access.[/quote]
English
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My Steam has been hacked before, and I am unable to access the PS account bound by others. What should I do
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You'll need to contact the owner of the PS account or Playstation Support to see if there's anything they can do to help. If that's unsuccessful, then unfortunately you will not be able to disable Cross Save or remove any accounts. Please read the Cross Save Guide for more information.
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That's really the end of it, my 4 years of hard work have been in vain, and I'm at a loss right now