American employees are too expensive, and have too many rights. You can't compete with child slaves in China when you have a federal minimum wage and labor laws. They're even cheaper than robots.
You can apply that attitude in general to open source software as well.
Most people using open source software trust it as implicitly as they would have to trust closed source software, they have to, because reviewing and comprehending all of the code running on any typical machine is impossible. Most people simply use open source and don't care about (or aren't capable of) dealing with the code, and of the ones that do, there is no guarantee that they're going to be competent.