People's personal conjectures or quantitative statements with no backing are interesting but they don't prove anything. If this is all about personal experiences, I will say my experiences in "large companies/organizations" have always been that they are actively avoiding proprietary software, sometimes even banning it's use entirely in new software projects (this is surprisingly common these days). The reasons are often different. Cost is a huge one, but security and the ability to modify the software is very notable, and it's rare for a big company to use an open source product in a mission critical setting without modifying it for their environment in some way. But there is a systemic bias in this result, because it comes from my experiences.
That's why I like independent studies to see how the world is moving. I like numbers but not when they come from myself or random people. It just doesn't lead to good science.