Yes, there are. In Draper, if the slope is over a certain percent, you can only build if the plans include mitigation that's signed off on by an engineer.

Now, a GOOD engineer can make them safe, but it's outrageously expensive. Edge Homes evidently found themselves an engineer willing to rubber-stamp anything and everything, or maybe they just didn't actually build to what the engineer specified.

If it's the former, Edge will try to pass liability on to the engineer, which is kind of fair, because putting your PE (professional engineer) stamp on things comes with responsibilities and liabilities. If it's the latter... they'll go bankrupt, victims will see nothing, and the owner will probably stay super rich, and move on to their next scheme.