I'm confused. How do you know what account scraped your email address from github in order to send you an email?
Or do you mean going after the accounts of companies that make use of a likely scraped email address? That's not a bad idea either, but it has risks and isn't the same thing.
Half the time they literally say it in the email. I just looked in my spam folder and just a few hours ago got an email titled "Your profile: Github", that started with:
> I came across your profile on GitHub. Given you're based in the US, I thought it might be relevant to reach out. > > Profile: https://github.com/tedivm
They aren't doing anything to hide it.