You can block words, such as NFT or crypto, by going to your user settings. I would recommend everybody to use this feature a lot to avoid stress and content that makes the angry, it’s quite helpful.
I like Twitter blocks! But you can't use a simple keyword block filter to block aggressive spammers who are careful to not use the obvious keywords. Also I'm actively engaged in discussion on Twitter about NFTs and Blockchains, so blocking those keywords does not work for me.