True. But there are already solutions in place to undermine this anonymity e.g. the bonus card system (see previous comment).

Yeah, it's a shame that people don't value their privacy to some miniscule percentage of their expenses.

People have absolutely no idea what trade off they're making I these cases. They just think they're getting a discount.

Tbh, $4-5k/year isn't a minuscule percentage of my expenses.