I'm sure they could produce (mostly) bug-free software if the cost-benefit ratio made sense. The problem with trying to ensure a web application is bug-free is

I'm sure they could produce (mostly) bug-free software if the cost-benefit ratio made sense. The problem with trying to ensure a web application is bug-free is that your incremental spend is probably greater than the incremental revenue. Self-driving cars are a different story. They will get sued when the cars make mistakes.