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Watch "Celebrating the 25 th Anniversary of IBM OS/2 Warp - on modern Hardware - 1994-2019" on YouTube
https://youtu.be/NXlrDXLGR_Y
IBM said that they'd open source OS/2 when all parties (read Microsoft) holding key elements of the OS agreed. Even though OS/2 is largely irrelevant today (due to its 32 bit nature), Microsoft still won't let it be open source.
In a fair fight, Windows is dead today, and OS/2 is still being developed. (Probably not FOSS; IBM was no saint.)
Hard to believe it's been 25 years since OS/2 Warp was released. Even harder to believe it's been almost 10 years since it was my daily driver.
It was reported in the newsgroups to be the best OS you ever used, or the worst OS you ever used. (The latter claim might be just attributed to paid Microsoft plants in the newsgroups.)
IBM was way to dysfunctional to fight the Microsoft monopoly. The measure of how much Microsoft support open source still lies in how open source OS/2 remains.