What's the benefit to the customer here? Idk if a store where I live started doing this, I would just stop going there. I know that can be difficult with the grocery monopolies in a lot of places, but I would try my hardest.
I think facial recognition should be banned outright because it's highly inaccurate, racially biased, and used improperly by law enforcement. But in cases like this, even just a ban for all non-law enforcement applications would be really helpful. People don't benefit from this! Just corporations, and barely so.
In my work as a government contractor, I witnessed the use of facial recognition for access control (getting into certain parts of a building) in exactly 1 building (of several dozens) and it was so completely unnecessary that I was left wondering what kind of nepotism or budget surplus lead to the implementation of such a lame security tool.