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There's a huge difference between a limited time sale that anyone can take advantage of vs charging higher prices to "the wrong sort of people" which is bigotry or "We'll use facial recognition to ID you, look up how much money you have, and charge a percentage of your income" which is where things are heading right now.

McDonalds gives people deals in their app because it tricks people into installing the app which they use to collect their customer's personal data (even when they aren't using the app) which they can sell or exploit in any way they see fit. It's a terrible deal for the customer, but they don't know any better because they don't get to see how that data is used against them.

Price discrimination leads to exploitation and enables bigotry. We've been being conditioned to accept it because ultimately companies want to abuse it to make more money at your expense. The only thing standing in their way is that most people understand that discriminatory pricing is unfair and dangerous https://link.springer.com/article/10.1057/s41272-019-00224-3