So now it only matters in finance? No one lost anything here. It's ridiculous to expect a payout due to an error like this. You wouldn't get one at a casino if e.g. a slot machine malfunctioned. What if the payout was $500M? Should they have to pay that as well?

Actually you won't get a payout if the slot machine malfunctioned: https://vegasclick.com/games/slots/malfunctions

The difference being that the slot machine owners are not the slot machine developers and it is not within their power to do anything to prevent the errors.

thanks, that was a typo

Sure, I'm entirely comfortable making life difficult for bookies.

And why is that? The rest of society has deemed it a ligitimate business. So you simply don't like gambling and that's why you want them to eat it? Not a very strong argument.

It's more that I think the activity of promoting gambling is one of getting your customers to eat it (It's advertised as a game of stakes, it's really just skimming transaction fees), so I don't mind it if what goes around comes around once in a while.

Society did no such thing; they weaseled their way into a legal grey zone and made themselves big before society had much say in it.