What Tailscale's terms say
Tailscale's terms of service and privacy policy have 11 rated points: 0 serious, 2 bad, 2 worth knowing and 7 good. 9 apply whenever you use the site, signed in or not; 2 only once you have an account.
Whenever you use Tailscale
Bad 2
Many different types of personal data are collected
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Where it says this ↗Your personal data may be used for marketing purposes
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Where it says this ↗
Worth knowing 2
The court of law governing the terms is in location X
The court of law governing the terms is in the Province of Ontario, Canada
Where it says this ↗
Good 5
The service claims that third parties it shares your personal information with are bound by confidentiality obligations
Third parties used by the service are bound by confidentiality obligations
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Where it says this ↗You can request access, correction and/or deletion of your data
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Where it says this ↗Information is provided about how your personal data is used
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Where it says this ↗
If you have a Tailscale account
Good 2
You can opt out of receiving promotional communications
You can opt out of promotional communications
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Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.