This subject has arisen on the forum many times, and warnings have been given that DJI will NOT "unbind" a drone. It is the buyer's responsibility to do their due dillengence and make sure the aircraft has been unbound by the previous owner...
Remember that APAS is simply a tool to try an help the operator in cases where the operator didn't see some obstacle. But it is always the operator's job to see and avoid. So, if a crash occurs because the drone hits something; #1 it's operator...
While I sympathise with you and your frustration the problem is between the original owner and the middleman who sold the drone to you. It’s the same problem you’d have if you were to buy a second hand iPhone that had not been reset by the...