[ploxiln]

GitHub actually manages attaching business org to personal accounts very well.

You can make notification emails related to the business org repos go to your work email, while all other notification emails go to your personal email.

When you fork a business org private repo into your account, it stays attached to the business org. Other members of the org can push to your fork of that repo but not your other personal or open-source repos. When your account is separated from the org, you lose access to your fork.

If the business org requires extra SAML/OIDC through their central auth service, you can still access your personal and public repos without doing it.

So yeah the business still has to remember to disconnect you from the org when you leave the company, but that's still true if you make a new github account anyway?