And it will continue until we can sue company being breached for criminal negligence. Should a single company executive be personally liable in these situations, the scale of the problem would be orders of magnitude less severe because they would spend the appropriate amount of effort to cover their damn ass.
This is it. These companies don't really care about their customer's data. Their SDLC is no more rigorous than any other SaaS product. They have junior people and (now) AI pushing code with a quick "LGTM" PR check just like everyone else.
The way to stop this is to have actual consequences for the decision makers here. You can build high-integrity software and some fields (avionics) have done it. But the organization needs to be built from the ground up to do it and nobody's going to do it if you can just get breached and offer a phony apology over and over again.
“Here’s a year of credit monitoring. Be grateful.”