I use a unique account with every distinct git org / github org that I interact with.

Even if I'm in my work profile and I need to do something in an org called `acmecorp`, I will create @acmecorp-identifier to do that.

This is just a very long experience...

* Security policies for work things have a blast radius of just that employer

* OSS things have a lifetime beyond the life of an employment / contract

* Source control elsewhere (GitHub / GitLab / Bitbucket / Gitea / Forgejo / etc) all has a local blast radius, and if a provider / org forces changes (roll your keys!) then the impact is limited to just that provider

* When something changes ownership (i.e. an org), the impact to me is low

It seems much more sane.

I think of a single git identity across multiple orgs as a bit of a smell.