Ask HN: GitHub login for B2D service?

I have been working on a B2D service. Right now my only login method is GitHub. I thought it made sense, since most seem to be using GitHub for their projects. It will use GitHub as a way to help add services to your development projects.

I wanted to know if this a bad way to go? Should I allow a native login? Various login types?

Thank you for your time and feedback on this issue.