It seems to have plateaued and increasing more slowly. Combining data from Steam and Statcounter reveals this:
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
May be similar to the 3d software world where autodesk created a monopoly and could charge around 5k USD for something like Maya, and then go the adobe route and only rent once innovation dies off. Only when Blender started getting more hype and attention did autodesk start offering cheaper indie versions and licenses.