Most of the recruiter traffic comes from LinkedIn, which is not particularly surprising. The very first line of my profile there reads:
Please do not contact me about cryptocurrency, blockchain, NFTs, or associated technologies.
Almost all recruiters who contact me on LinkedIn are talking about... cryptocurrency, blockchains, or NFTs etc. If a recruiter isn't prepared to read even the first line of my profile then I think I'm fine to ignore them. For all other recruiters I'll send a polite and friendly "thanks, but I'm not looking at this time".