NFTs are really easy to make, like Donald Trumps recent cards that sold out for $100 each. x 44k Supply / Demand is the driving force behind the value of NFTs, but this also applies to the underlying Blockchain. Ethereum is one available blockchain on OpenSea. This is an NFT:
https://opensea.io/assets/matic/0x2953399124f0cbb46d2cbacd8a89cf0599974963/55928068987212936364719946397266256012330145460295318975533237012681824665601
4dBender Post 1 - Anons Collection | OpenSea
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https://opensea.io/assets/matic/0x2953399124f0cbb46d2cbacd8a89cf0599974963/55928068987212936364719946397266256012330145460295318975533237012681824665601