its like putting trading cards on a digital ledger everyone can see publicly and you can prove you own and then trade etc, so its a scam in the same way magic the gathering is a scam or the art collecting community is a scam etc, is an expensive rare comic book a scam?
thats not to say every NFT project or NFT purchased is not a scam, surely some are, one of the cool things is that is open and public for anyone to use or make an NFT just like with other crypto or blockchain things the whole point is that there are lower barriers to entry and its decentralized, so once bitcoin was released anyone could copy and paste the code and make their own bitcoin which is why there are so many copy cats and you see that with NFTs now that there are a lot of copy cats
a lot of this blockchain stuff will just become background infrastructure for your transactions in money or digital goods or in a video game, the early implementations make a lot of noise and often fail loudly and with a lot of attention but the silent successes will keep developing its just really not about selling a gif on a gold chain