Hello @iuqa thank you for getting in touch with us about your accounts.
Your game is directly attached to your Ubisoft account, it can not be transferred between any Steam accounts.
All of your in-game progress is also attached to your Ubisoft account. If you create a new Ubisoft account or Steam account, you will need to start your progress over and unlock your operators again.
A player is only able to transfer the game between Ubisoft accounts, that they own two Ubisoft accounts, and they can only transfer games by when consolidating both accounts into one, and asking us to delete the spare Ubisoft account.
I hope this has answered your questions about account ownership, if you have anymore, please let us know in the thread?