Just because you are too 'busy' to read the contract doesn't mean you are safe to assume what that contract contained.
You should be able to assume that the state isn't watching you walk to work, or who your friends are. But, when you sit down and sign a contract, it is YOUR responsibility to make sure you know what you are signing, and if you don't agree to the letter of it, don't sign.
It is important to 'raise the alarm', but if a person can't be bothered to do their part in a contact signing, as in reading the damn thing, then they can't play victim.
While it isn't 'clear' (haha) if Clear has the legal ability to sell the info, if the clients signed a contract giving Clear the right, the clients are out of luck. Their lack of effort isn't an assault on privacy, it's a symptom of how profoundly lazy we have become.
If you sign away your privacy, then it isn't the evil corporation's fault, it is yours.
Grow some responsibility people.