The NFT craze is about ownership. The digital world allows for mass production of anything, and so in the crowded noises of the internet, having an establish and verifiable ownership of something is increasingly valuable.
In 2021, we saw this pop up in a few ways: collectibles and artwork. It makes sense that these two places were some of the first NFT crazes since both take ownership quite seriously. Any fan of collectibles will know how important items like a certificate of authenticity would be. NFTs solve that by keeping entire histories on a visible chain like Ethereum (ETH-USD).