I think it is because of the Applicant Tracking Systems. They scan for keywords and if you have them your resume gets better ranking. The actual recruiter is working only from resumes that the ATS recommends.
From your LinkedIn:
- You have two degrees, including one in an incredibly "hot" field right now.
- You've co-founded two companies.
- You were accepted into a Microsoft program as a student.
- You are quite good looking.
Ignoring your local reputation, that alone puts you in the top few percent of candidates.
Sometimes they may have a huge database of people or an account somewhere that lets them search for people that may fit the role. But the candidates found through those searches are typically pretty low quality.
Someone who applies for a specific position is just going to be checked if they meet the requirements and look like a good candidate.