I think it's they don't want to set a precedent on refunding for bugs because one bug could cost them millions.

Is that even legal? What happens if my landlord accidentally charges me 10x rent this month and refuse to correct it even after I ask? That's just straight up stealing. I feel like at a minimum I'm getting my money back one way or another, and they are likely to face consequences for theft.

But, no need to set a precedent: I'm quite confident that a US court would refund a person or company that overpaid due to a bug in Antropic's billing.

This is not just one bug, though; it’s a bug that takes money that ain’t theirs to take.