SSO via Glitch account for projects?

I would like to piggyback off Glitch itself as a single-sign-on for my own project. That is, check if the current visitor is signed into Glitch and query their public profile info. I could then use that in my own code.

This might be impossible / inadvisable for privacy & security reasons, but it seems like it would be super convenient.

Sorry, but I do not believe this is possible for as you mentioned security reasons. You may technically be able to create something that can look for a logon or a tab open for glitch but that seems spyware-ish.