And then there's the whole "customers will switch to another more reliable party in case of outages or security problems".

Outages? Yes. Security problems? LMAO!

You have to put on a show that you are sticking to those processes, on paper. But the fines for data breaches are generally way less than they save on not having a fully funded IT department and using security products that someone got a kickback for rather than the best product.

"Hacking" isn't some magical, intensely creative process for geniuses loke on TV. For the most part, it's usually just finding the really common things that IT departments don't do because they are underfunded and treat IT people like replaceable cogs. There is software out there to exploit those deficiencies. So they are forced to do things like use default or obvious admin passwords because who knows who is going to be there tomorrow to fix something and without the proper tools to store credentials, there's no way to properly secure things.

And when a security vulnerability is found, there's a reason why many don't bother informing the company before going to the media. Those companies pour tons of money into lawyers to avoid admitting the fault, often getting the innocent person who found the problem arrested, and never fix the actual issue. Just ask any pro whitehat security researcher not hired by the company all the things they have to do to protect themselves from being sued or arrested for "hacking" when they notice a problem.

And government technical auditors are a rarity because the regulators are underfunded. So they might go through some small list of things during regular audits, but they don't know to check if a DBMS system that contains backups and is stored "in the cloud" is using a default password or other common hacking targets. Hackers don't go after the primary infrastructure most of the time. It's not necessary because there are so many sloppy processes or left over insecure projects that "the last guy" was working on or that got defunded before it was completed, but only the primary infrastructure gets audited usually because that's all there is time and money for.

As for going somewhere else, there often aren't other places to go and when there are they usually have the same problem because there's very little reason for any of them to compete with each other. Most industries have consolidated so much that there are only a handful of parent companies left so it's easy to collude just because their leaders are often all in the same room at conferences and such.