No clue about LinkedIn as I don't use or like the platform, but mails aren't really hidden on GH. Most people display one on their profiles (or in their commits). I do the first, and recruiters still spam different addresses of mine as well. Why make this any easier?
Hello HN! We're happy to share Nymeria with everyone and looking for any and all feedback. We are currently focused on finding and surfacing the best emails for LinkedIn and GitHub users and hope others find Nymeria as useful as we have!