Huh. I don't know about the financial system but I'm guessing a good chunk of it is ran by some old mainframes.
It's like the retail industry, still massively relying on IBM i/iSeries/AS400. I worked for a consulting company that was doing a little bit of admin and support work for companies still using this system and the list is still very long. At least it still receives updates, and it's kind of fun/odd to work with if you like CLI, but it's super expensive and absolutely proprietary.
There's already milk in the ingredients so adding some must be acceptable.
But since we mention Doritos, it's one of the things that I noticed how fast it got expensive. They nearly doubled in price since the pandemic.
Like, where I live a bag was around $3.49 a few years ago and now they charge $5.49, for a single bag! I was buying a bag once in a while but since it crossed the $5 mark, I leave them on the shelves.