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by IIsi50MHz 395 days ago
And is commonly used for authentication codes, and like Social Security Number, it is PII that should be default-deny.

Github seems to have no legit need for a user's phone number. Since there's not even a way to tell them to go pound sand, I'd say opting out of disclosing sensitive information they don't need by not signing in/up and equating their unreasonable demand with a ban is respectable.