Small businesses I regular almost always give me a discount for using cash. Even when I make several hundred dollar purchases they extra appreciate it. They avoid the visa/stripe fees and I avoid my purchasing data being sold to advertisers. Everyone wins.
Brave and strong people with morals will quit working for the company. Customer service will worsen. People will start taking their money elsewhere.
Most people want to improve society; however, if every day it becomes clear to an employee that they are helping an evil megacorp some employees will try to do something about it. Example: Inform management how their policy is turning customers away. That it happens multiple times a day. That Sherry got a new job because she got tired following management's evil policies.
In closing they can do something about it. If enough of them push it up to their leadership, leadership will make changes. Come on bro you know this.
Been there done that. In some ways the best time of my life, and another ways the worst time of my life. However momentary homelessness does put things into perspective for a person.
What's important? Having that flashy new car or driving that junker that I must work on every two months.
Keeping up with the Joneses or living frugally? There's a big difference between needs and wants.
Making smart financial choices so that I can have a spine when speaking to my boss? Yes.
Post script: People can get a new job before quitting their current job...
Post script two: People can also bring issues up to leadership in a respectful way that doesn't risk unemployment. If someone's leadership is a tyrannical, it's probably best to get fired anyhow. Oppression is never a good feeling; be it from a boss or a government.
Seen at independent shops, sometimes with a discount for cash payment.