Folks don't apprentice what an amazing thing OpenID was, and what a monstrous act of vandalism Google's destruction of it was.
You could literally put up a minimal site on your own domain with whatever authentication method you prefer, and use that URL as your identity to login to any site supporting OpenID correctly.
No need to use your identity on some big social media site they trusted and offered as a login option. No need to risk compromise of access to those accounts like with OAuth.
Just your own identity you really own, and no password hell.