I'm not saying that big tech isn't hijacking open source software, but that does not mean that free or OSS was always "meant to devalue" devs or small companies.
Until very recently, big tech pumped untold millions of dollars into obliterating FLOSS altogether, calling it a cancer that will destroy any enterprise it touches.
You mean just Microsoft. Microsoft was an outlier. Even in the 90s, Linux and GCC were being funded by big tech. Obviously they were developed with the best of intentions, but I think it's accurate to say that OSS is "meant" to devalue developers because the purpose of a system is what it does, and that is what it does in practice.