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I'll give my SSN to a healthcare provider, and maybe a bank. Random vendor using Stripe? Probably not.

Edit: to be a little less flippant, what is an example of a Stripe user to whom you would be comfortable giving your SSN?

An employment related service could legitimately require a valid SSN.

Yes - most U.S. post-degree jobs require background checks which will almost certainly require giving your SSN to the employer.

It mentions KYC, so for example Etsy might use it to verify a vendor that it sends earnings along with a 1099.