It would be not possible to trace the scammer since bitcoin is decentralized and the information of the sender and receiver is anonymous and cannot be traced.
This is not true. Bitcoin is not anonymous, instead, it's pseudonymous. Moreover, bitcoin blockchain is transparent and available to public. You can trace where the transaction is going, from where he is receiving fund as well as his previous records of transaction. It's very much easy to trace, even more easy to trace than fiat money in my opinion.
You have to spend some times behind the scammer, most likely today or tomorrow he will leave a footprint from where you can get his identity- if the address receive a transaction from an exchange or if he ever execute a transaction to an exchange etc. By this way, you can trace anyone in bitcoin blockchain. Well, it's time consuming and you have to wait for the scammer to make a mistake and leave a footprint anywhere between his transaction. Depending on the amount of being scammed, the victim may try to have a regular update of the scammer movement. For a lower amount, it certainly doesn't worth the time you have to spend.