And further to the above, what to you sign in to Tailscale with? (Yes this applies only to a subset of people who care about Tailscale.) They don't want to be a

And further to the above, what to you sign in to Tailscale with? (Yes this applies only to a subset of people who care about Tailscale.) They don't want to be an identity provider so they don't offer an email account type. You can choose from Google, Microsoft, GitHub, Apple, or OIDC. In theory, you can choose something else that provides OIDC; in practice, I don't know how well that actually works.