Honestly I don't know. I'm just pointing out the only thing that kind of sort of sounded like a good idea for it I've ever heard. For pictures it's stupid that's for sure
No, they are right. What they are saying is that even though pretty much all NFTs contain a link to a picture on the blockchain, theoretically you could write a really, really small image in the space where you would normally write the URL. From a quick google, that’s 100 bytes. For a black and white image, that’s 100 pixels. For color, that’s around 30 pixels