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Absolutely not, it is not reasonable or expected that a credit card company launch a website that doesn't work with Firefox.
> Back in the day, my university would load balance based on the browser being used.
What on earth?
To your specific point about just moving elsewhere, complaining in public about bad industry practices is part of Capitalism and part of how consumers regulate the free market. "Take your business elsewhere instead of complaining" has never really been how this has worked; businesses don't get to opt out of being shamed just because they have a cancellation form, and they shouldn't have any expectation that users will or should be quiet about their bad business practices. The free market is not a replacement for criticism within social spaces; the free market works alongside that criticism and is reinforced by that criticism.
Public complaining is an essential part of how consumers within a free market coordinate with each other and educate each other about abusive corporate behavior, and it serves as an additional mechanism alongside boycotts and cancellations to help punish bad actors in the market.
Oh well, what can you do? Vote with your wallet. Tell everyone on HN and Reddit. I agree. But at a certain point it wastes too much of my energy, so I'll basically just cancel cand tell them I can not use their service because reasons, very disappointed, bye.