Knew this was coming at scale sooner or later. Something of a concern to me personally, because my own gait is particularly identifiable to those who know me.
Aside from footwear, and possibly using various inserts to change the way one’s foot falls on the ground, I don’t have any obvious thoughts for defeating this unfortunately. The problem with any sort of inserts is that they’re likely to cause other problems over time for the same reason they could theoretically mask one’s gait - unnatural walking tends to be bad for the body on the whole, and to cause more widespread problems over time.
I definitively walk differently in e.g., Birks, generic sandals, and generic slip-on closed-toe shoes.
Each one is quite consistent and recognizable, unfortunately, which puts me in a position of few options for working around this sort of technology. If you see me in Birks a decade ago, you’ll know me in Birks today without having to see anything above my hip.