It's really easy in home construction to make a profit if you hire illegal immigrants, pay them an illegal wage, don't carry insurance, don't pay payroll taxes, and don't pay overtime. If only I could hide all that behind an app, I'd call it a startup and become a billionaire!
It's to the point where I have serious issues with the morals of people working for and investing in such outright abusive companies. You might "just" be a programmer, but you're still earning your paycheck breaking the law and skimming money away from businesses that are legit, protect their customers, and exercise the base level of ethics. But I guess you personally didn't abandon a handicapped person on the side of the road, or deny a trip to a black neighborhood, so you don't feel like you did anything wrong?