@mattly I really like your login bingo series of blog posts!
Something that has always surprised me about oauth is the lack of discussion for end users about identity providers' level of control over your digital life. Every service I use that requires Google or GitHub as an identity provider is one more fiber in the cable binding me to Google/GitHub.
I'm not even sure how to figure out what all those fibers are, if I want to get rid of my Google account, let alone how to change them.