This is an example of why “they’re private businesses so they can ban whoever they want for any reason” is problematic.
I’m wondering if maybe there should be a size threshold for full consent on business dealings. Like if you run a small business, you get to kick anyone out for any reason. But if your business is so big that it runs a significant portion of the market, then you would need to adhere to certain standards for how and when you ban someone from doing business with you.