Rings don't get hijacked or stolen, they abandoned by the manager and the we are forced to take over management. Generally we allow some other interested manager to take over.
this is what happened with the ring you managed, per out TOS.
You were sent weekly reminder emails for seven weeks asking you to manage the ring, which had not been managed in 102 days when we took it over. That is too long to go unmanaged when there are pending submissions or suspended sites requiring attention.
If you wish you can contact the current manager about taking it back over, but they are under no obligation to either give it back or "sell" it back for acitvity points even.