Did GitHub sell my E-Mail?

Hi, Today I got an email from Turing Enterprises Inc with advertisement for their service. Since I use individually created email addresses for every account, I set up I traced the mail back to GitHub.

Now I have the following questions in my head. Did someone else get those emails? Did maybe gitbub sell my email address to them? Is your email publicly exposed on github and you first need to turn on some privacy function? Am I allowed to …

e-mail github mail privacy