Notably, the line-skipping benefit to users only exists if a minority of people use it. If it becomes widely used, it degrades to the old state of affairs (i.e. waiting in line behind all the other CLEAR users). Without actual increases to throughput of the TSA checkpoint, it's only temporarily beneficial to early adopters as everyone else catches up. And when we're done, a private company has gathered loads of facial recognition data, CLEAR flyers paid for the privilege of giving it up, and they still have to wait in line.