Not just financial, but your physical address (unless you are using a po box, which can still be correlated to you), ip, approx location, local devices, phone unique identifier, browsing habits. I am not going to try and name all the kinds of data collectable, but it is trivial to use data related to your device to hack it.

For your question, most likely if you are not a person of interest then attacks wont be specific to you but against a group. So for the hacker, attacking a wildly popular app to extract the info already available is bettee than individually cracking whatever algorithm was used to hash specific data (unless they already have a piece of it).

An example: A hacker tricks an employee into getting username and password (realistically trivial). They spread their influence till they reach an individual with system privelege. They use the private keys they obtain to decrypt financial and account data. The company doesnt even know they are compromised (often takes them months). Now they have two oppertunities. They can sell the cards in bulk on the black market and sell/use all the data harvested by this invassive app. People make mistakes and with a list of emails they can phish the shit out of everyone using the official corp. templates.

Your data isnt just at risk to the first party who collected it, but also 3rd parties who obtain it, legit or otherwise.