Suppose I was someone with money to launder. I'd draw a cat's arse, and buy it with my anonymous BTC wallet "money". No one would ever know where the money come from, especially if I anonymise transactions with one of the many services (e.g.: from what i read, some buy mining services, pay with the dirty money and viola, "clean" coin, while other services just make thousands of transactions to distribute payments and lose one's trace).
If I wanted to be real clever, I'd buy Elon Musk's or Jack's NFT, and sell it for more because hey "it's made by someone popular" so its more credible.
That's one explanation I have for the crazy amount of money moving around NFTs. Sure there are naive people, or some genuine traders, swapping NFT but those are a small percentage, and as the quote goes:
"When you have eliminated the impossible, whatever remains, however improbable, must be the truth?". Literally 90% of the coins and NFT's i dug into have no application and look at least dodgy if not outright scammy.
I have no proof other than my observations, just adding my thoughts to the conversation. The "it's rare" and "non fungible" arguments don't really stand in my view. There is a ton of rare stuff out in the real world that's simply useless.