The smell of my first IBM ThinkPad was quite strong. Today that smell triggers good memories of playing old video games or building my first website. I still keep that laptop only to occasionally smell it.
Because IPFS is decentralised permanent storage. Blockchain handles ownership, IPFS handles metadata, visual assets, etc. It's kinda how things work in real world with real estate, for example. There is a registry and there is physical property. Same here.
Some tokens have license in their metadata allowing the token owner to monetise and redistribute the artwork. The original author still has author' rights.