At some point companies are large enough that not having an account is an handicap. IIRC, the supreme court of Canada mentioned in a ruling that Facebook terms are unenforceable because they can't be negotiated and because not having an account in too consequential. In essence, it's not a agreement you freely enter in. It was about forced arbitration.

My point is there are limits that what private companies can do. Stretching the boundaries like that is sure to cause a strong regulatory reaction at some point.