Except things like ATMs are not. They use eventual consistency.

Very few financial systems are ACID. Why do people still think banks run on bloody MySQL?

I love a non-sequitur as much as the next giraffe, but what does banks using MySQL have to do with banks choosing not to go ACID?

Nothing at all other than the ever surfacing assumption by a lot of people that financial traffic is done on ACID like principles (rather than eventual consistency which it actually is). MySQL was a random example as should have been somewhat obvious.

MySQL is a random example of financial traffic not following ACID principles? I still don't understand.

Is this a reference to MySQL, pre-InnoDB, not being ACID compliant? InnoDB's been around for a decade and has been the default database engine for years.