NFT has a great idea, but at the moment NFT projects are used very stupidly. Some mediocre pictures, inscriptions and so on are for sale. In fact, at the moment NFT projects are used only for the purpose of enrichment and nothing more, and the sale of this tweet is a confirmation of this.
That is the beauty of it, everyone can make their own NFTs, just like in cryptocurrency where everyone can make their own coin. I think that this is a good thing because this ensures that there is no possibility of monopoly in NFT because anyone can create one and they might become a sought after like the other established NFT. Now considering Jack Dorsey's tweet, I think that it is a pretty stupid one, he could have made an NFT where it is just his signature, I mean real signature from celebrities can fetch good price and a digital one can be a possibility.