NFT is a tool to authenticate an artist's work

NFTs presents a new medium for artists and creators to showcase and monetize their creations. In turn, collectors have transparency into the authenticity and origin of their purchases.

While you can screenshot an NFT without purchasing it, you would not be able to sell it at the value of the original. Every time the NFT moves on the secondary market, the new owner and the purchase price is automatically recorded on a blockchain for everyone to see. Ultimately, you are not buying the picture - you're buying the property rights to the picture.