Another good use for BIN information is justifying tax decisions. A little while back the VAT rules in the EU changed for online merchants. Before, you collected VAT based on your location. After, you collected VAT based on the buyer's location.
Each country implemented a thing called VAT MOSS, and you can register with a country's tax authority to use their VAT MOSS system. You only have to do this in one country. Once a quarter you submit a VAT MOSS form that lists your sales in each EU country and how much VAT you collected. You pay that to the tax authority of the country whose VAT MOSS system you use, and they distribute the appropriate amount to each country.
They don't want it to be trivial for online buyers in high VAT counties to claim they are in some low VAT country, so merchants are not allowed to simply collect the VAT for whatever country the customer picks on the "country" drop down during check out. The merchant is required to have two pieces of non-contradictory evidence to justify their choice of which country's VAT to collect. One can be the country selected by the customer.
What we normally use where I work is the customer's selected country and the country that MaxMind's ip to country database says they are ordering from. If those two agree that's two pieces of non-contradictory evidence and we're done.
That's good enough most of the time but sometimes it fails. In that case I'll lookup the bank that issued their credit card from the BIN. Almost every time that bank turns out to be a bank from the country that the customer claimed to be from, giving two pieces of non-contradictory evidence for that country. Maybe once or twice the bank from the BIN did not match the claimed country but did match the IP country, so I went with that instead.
There have only been a handful of times when that was not good enough, and I had to dive into their past orders, support tickets, and logs of their software contacting our update servers to play detective and try to get enough evidence to justify picking a country.