There's a big difference here in that NFTs as currently implemented are nothing more than an a trend. They don't have any actual value, or function. At least with BTC you could buy drugs.

What can you actually do with Nyan cat other than just sell it on to the next person. I can enjoy the image and I don't even own it.

NFTs are neat, don't get me wrong, but to have any value or use, they require an element of trust behind it.