NFTs are transferable and service-independent. Meaning you can trade used digital media and they will continue working even when Sony goes out of business, just like physical media would. Another big advantage is that they are generic, they are just abstract "ownership", you can use them for books, games, monkey pictures or concert tickets. Any normal commercial alternative would almost certainly be locked to a specific type of media and to a set of companies, along with strict rules to follow, if they allow any outsiders to participate at all. NFTs are an open system where everybody can build something with them.

That said, this is all very theoretical. Blockchain needs to get fast and cheap before any of this makes sense.