I suggest you have a look at Bell Labs, Xerox and Berkeley, as a simple introduction to the topic - if you thing OSS came from "the goodness of their hearts" instead of a practical business necessity, I have a bridge to sell you.
I would also recommend you to peruse the last 50 years for completely reproductible, homegrown or open computing hardware systems you can build yourself from scratch without requiring overly expensive or exotic hardware. Yes, homegrown CPUs exist, but they "barely work" and often still rely on logic gates. Can you produce 74xx series ICs reliably in a homelab setting? Maybe, but for most of us, probably not. And certainly not for the guys ranting about "companies taking over".
If can't build your computing devices from scratch, store bought is fine. If you can, you're the exception and not the rule.
The entire open source movement would like a word with you.