Remember when NFTs sold for millions of dollars? 95% of the digital collectibles are now probably worthless.
(markets.businessinsider.com)
The use case for NFTs is to provide a bulletproof cryptographically secured registry for arbitrary content. Such as deeds or titles. Legally recognized, that would represent a marked improvement on the current system. You can have it represent digital goods also, that's just more of a toy than a useful tool.