Earlier quoted context omitted.
Niche: (2d) a specialized market https://www.merriam-webster.com/dictionary/niche In this case the market is "security critical operations."
How the dictionary defines “niche” doesn’t really matter. It’s the storytelling that matters. A prosecutor might be motivated by and could cite the "tens of billions of dollars" quote. Building compelling narratives is one of the key skills a prosecutor (or any other lawyer) brings to bear in order to win cases.
> Calling stagex a "niche Linux OS" suggests that hardly anyone uses it.