If the warranty travels with the NFT, then it provides an avenue for the fraud to be uncovered, and since the intended life of the bag is recorded in the blockc

If the warranty travels with the NFT, then it provides an avenue for the fraud to be uncovered, and since the intended life of the bag is recorded in the blockchain, the fraudster can be determined. I think it'd be more difficult to get away with what you describe on a large scale with the NFT in the picture than without.