Why can you take other people's pictures as NFT?

 I see a lot of people selling NFTs with celebrity photos for thousands of dollars, even though 

NFTs (Non-fungible tokens) are digital assets created for the purpose of collecting. But recently, I see a situation where many photos of celebrities, KOLs on social networks... are also created into dozens of similar NFTs, including NFTs for sale for tens of thousands of dollars.

Do those NFTs have any value and why is it possible to use someone else's picture as such an NFT?
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