I completely understand your situation. GitHub isn't the perfect fit for everyone, especially for those in specialized roles like ML SRE
GitMatcher is primarily aimed at the sourcing stage, where recruiters can find devs based on their actual code contributions. But I agree, it's not a one-size-fits-all solution — it's not meant to replace LinkedIn or fully capture your career.
I think the problem runs deeper than that. What you’ve done is an interesting tool for finding out more about a relatively small slice of developers.