I ran the older OpenID protocol for years, but over time, everyone stopped supporting OpenID. Stackoverflow was the last big provider that dropped it entirely. Sure we have OpenID Connect (which is OAuth2 based) and this project mentioned both OpenID/OIDConnect and how it expands on it, but the problem is getting people to allow support on their websites.

I think the only places we may see support are newer Fediverse servers like Mastodon, Pleroma, Pixelfed, et. al.

Here's my previous article on OpenID:

https://penguindreams.org/blog/the-decline-of-openid/