A recruiter sends me an email or a LinkedIn message about once a week. Sometimes more. Sometimes less.
After following through with each relevant enquiry for over a year I formed a hypothesis:
They need to show someone that they are contacting some minimum number of potentially qualified candidates but have little to no interest in promoting me as a candidate.
This is a generalization.
For example there was one recruiter, a Navy vet, who took the time to get to know me a bit after realizing the current opening wasn't a good fit because he thought I'd be a great candidate for some other opening they were likely to see.
He actually called back about a position a little while later and there was some back and forth but the employer wasn't interested because my address was 3 miles further away from the business than he wanted.
Now either that was the employer's real reason, in which case he's a ignorant twat, or I didn't fit his cultural expectations. Either way makes no difference.
Fast forward to me giving up on tech people using their brains for anything other than ear spacers and it turns out I'm happier not competing for the approval of terrible people who think they're smart.
Which is to say, I stopped responding to recruiters a while back.