alt Hacker NewsI've spent a lot of my career marketing to developers, and spamming their GitHub account might be top 1 or 2 worst marketing tactics you can use.
Cold emailing rarely works by itself. Cold emailing developers via emails you pulled from their GitHub accounts? At that point, you're actively harming your brand, and may as well just send them spam diet pill ads.
If someone took the time to look through my GitHub contributions then pitched me with a job relevant to that work I would absolutely consider them. That's exactly the kind of recruiter I would like to work with.
If it's obviously just a bot scraping emails and sending generic job requests, that's very different.