The other use I read about recently was using them as a proxy for buying some sort of illicit good or service, i.e "here's $600,000 for that wink NFT wink I wanted".
Not my space though so might be off by a mile :')
Better yet send money from X through a bunch of privacy oriented tokens like monero, tumblers and mixing services, losing 20-50% in the process and consolidating the rest in account Y. Now you have plausibly clean money but you can't pay taxes yet as there's no paper trail for this income. Solution is easy, buy an NFT from yourself, declare it, pay taxes and buy a new yacht.
For a larger operation going business route is still preferable but on an individual level NFTs are much easier due to ridiculously high margins that have been normalized there.
To my understanding, all these things leave simple 1-1 paper trails that can be followed later and lead to consequences, but I might certainly be wrong.
I'm trying to separate people who simply don't like cryptocurrencies and NFTs (which might be your case, I don't know) from actually informed thoughts about what's happening.