I never trusted these devices and unless mandatory I opt out. If one of these systems gets hacked and the encryption is poor now my fingerprint image scan or data points is irretrievably in the wild. A few years ago my gym installed fingerprint scanners to speed up entry to the gym instead of a clerk checking ID cards. I opted to continue to use my ID card and at first there was subtle and not so subtle pressure to use the FP scanner. I complained to corporate and eventually they must have got the message as the clerks check my ID to let me in the gym without complaint or (passive aggressive) delay.