The TSA has attempted to roll out more facial recognition in airports but has so far been blocked from doing so. Clear is stepping in to gather all that biometric data for them, in addition to the fingerprints and Iris scans they already have, and provid it to TSA directly while making a profit on the side from doing so. 
“In the near future, Clear’s new facial recognition system will electronically transmit members’ digital identities to TSA’s second-generation Credential Authentication Technology (CAT-2) scanners, Clear says.”
https://www.cntraveler.com/story/clear-at-airport-facial-recognition
TSA hates Clear and their steps into facial recognition are meant to, among other things, eradicate them. Clear is already living on borrowed time and their value proposition has already been largely eroded by traditional precheck. CAT-2 is the coup de grace.