Curious isn't it, especially as it's such a bad fit for their product - authenticating with GitHub in order to ssh made the whole thing so much more painful than it needed to be. I subsequently tried switching to using a passkey when that became an option, but it's not possible to make the passkey user the owner of a tailnet created by a GitHub org user, so I'm stuck with two users in my Tailscale and can't delete the GitHub org user. It's the main thing that keeps me looking for a reliable alternative to Tailscale.
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ZeroTier. It works well for me. I chose it over Tailscale because it doesn't require a third party for login.