I mean yeah this ain't really too surprising to me. Since I took interest in bitcoin and signed up on some websites and stuff - or maybe its just due to my search data being used/sold in a particular way, I found myself getting more and more spam emails that were related to crypto in some way or the other.
Crypto scams happened because of people's improper understanding and lack of security knowledge. The reason why you're getting the crypto related spam emails is that you used the email to register on an unworth site and this is what will always happen if you don't research about a particular site before using it.
But I'm afraid that NFTs have actually made this worse than it ever needed to be, and ofcourse the ICO for shitcoins - which people blindly invest in without looking into their history and then the project just up and vanishes. Its pretty much our duty to educate others/who are new to crypto about these to make them less gullible to these scams.
NFT or ICO didn't make anything worse, investor lack of knowledge is the major problem we have in crypto and if people don't educate themselves about crypto investment and security they will always be prey to the crypto scammer.