It says updated 2024-03-13 from source https://tailscale.com/pricing, but "SSO with any IdP" is in the Starter plan before that [edit: no, I'm wrong, it used to say "standard" not "any"]: https://web.archive.org/web/20240309045009/https://tailscale...

Are they talking about something different?

SSO Tax is usually about using your private SSO, not Google or GitHub. If they say "any IdP", then the data on ssotax must be out of date.

Oh, you're right. It used to say "SSO with standard IdP" and now says "SSO with any IdP". The site is out of date, despite its claimed update date.

It's a community project, you can just update it :-)

Oh nice, I retract my complaint then if they've moved to actually supporting good security out of the box without an extra fee.

Hi! Tailscalar here. I posted to the OP, but just to flag this is correct. We removed our 'sso tax' a couple weeks ago from our pricing plans, and I released a blog today about it being removed entirely. Extremely happy it's gone!