Yeah, I feel like people either overlook or underestimate the uniqueness of a person's gait. I feel the only issue with it is collecting the information on it, as it requires more than just a picture.
Sure, if you change the rocks daily, while wearing a mask, and having sunglasses on. However, the context was around how mask wearing and eye covering is fairly normalized at the moment, not about how people started enjoying putting rocks in their shoes.
Still a bit more difficult to implement than facial recognition, which is now trivial to set up with AWS Rekognition. Even Photoprism does a great job.
Facial recognition for bucketing photos is much easier than for biometric security. Both might still be easy these days (I wouldn’t know, I am not as in the loop for AI as I’d like to be), but the former was good enough at least a decade before people seriously used the latter.
Would something like gait be easy to fake - just being aware of how you walk... Putting a thumbtack in your right foot, or something along those lines?
Until you start looking at things such as height + weight + gait.