Other auth providers for sure. We'll be adding shortly.
Using an alternate auth provider won't even prevent you from scanning non-public GitHub code. There's a GitHub OAuth App just for auth (which is what you're seeing here), and a separate GitHub App that you need to install either way to give Detail access to the right repos. We can swap out the former for Google/Okta/pw if you want to avoid this warning. GitHub Apps (the half that manages repo access) have a much finer grained permissions model.
Using an alternate auth provider won't even prevent you from scanning non-public GitHub code. There's a GitHub OAuth App just for auth (which is what you're seeing here), and a separate GitHub App that you need to install either way to give Detail access to the right repos. We can swap out the former for Google/Okta/pw if you want to avoid this warning. GitHub Apps (the half that manages repo access) have a much finer grained permissions model.