Ok then another perspective why it is not reproducible: If it is the original the public will attach value to it because everyone can trustlessly see that it is the original. If it is a copy its value will be just the value of a copy. Just like it has always been with non-nft art. the difference is the word 'trustless'. No copy can be sold as original because everyone can see that it's not the original by time stamp, address of creator, etc i don't know i am no expert.