Well, if NFTs are a scam, then anything you buy for money is a scam. Usually we reserve "scams" for "trickeries", fooling someone out of their money, when they don't really want to. In this case, people are willingly buying NFTs.

Maybe a better word is to use "hyped" or "mania" or something, because it's not really a "scam" as no one really own NFTs as a whole and are fooling others.

Disclaimer: I'm myself not into NFTs because it mostly seems like hype at this point, I own zero NFTs myself and have no interest in buying. But I also care about accuracy.

Getting scammed by John Cleese has clear value.

But what it is is very clearly communicated