antrad88: Steam survey. Valve is the biggest company trying to push Linux gaming on their platform, but after SteamOS and now the Proton project they still can't go over 1% Linux.
Also interesting fact is when Steam dropped support for Windows XP last year, XP had similar user percentage as Linux even though it was 18 years old OS that was unsupported by Microsoft.
https://store.steampowered.com/hwsurvey Most of long-term Linux users are against home-pinging software or software which strips them of control from things which they themselves paid for. There is big collision with DRM part of Steam and Linux/FSF mentality, I think in unrealistic case of Steam dropping DRM, there would be some drastical changes in that percentage. I also think that marketshare is not what Valve is actually persuing with its Linux program, but its something very similar to Linux/FSF mentality - free control. Given a chance that MS suits Valve and denies it the right to use parts of Windows in development or runtime, Proton is Valve's lifeguard from take over or milking.
Further, lets talk about percentage logic which you applied. Maybe its because this logic is flawed and was purposely IMPLANTED in our heads as part of the long playing plan? A good proof is that the well known that major OS player now always fought for securing largest marketshare by ANY means possible, including murder (MS vs DR; MS vs Google, when MS agent purposely burned Nokia; MS vs Apple). Corporate sheep-control logic at its best. And as you noticed it doesn't explain why does Steam invest in Linux, which should rise some questions.
One thing is that %percentages% are related to multiplicands and not numbers, not what humans typically perceive them to be. The 1% of 1,000,000 are still real living 10,000; the 95% of 1 are still below 1. Like it is said, if you saved a dog, its statistically irrelevant, but for dog itself its greatly relevant. Further examples: 55% of population are women, 45% are men - that means men are not worth investing :-]
Other thing is that the logic which stands behind marketshare percentage is greed in its purest form: profit-based, return-of-investment calculated, it purposely blinds other factors. Well if your PRIME goal is solely making profit, then the logic is mostly correct, in larger scope case - its flawed. It doesn't calculate any other factors like synergies, time dynamics, core incompatibilities of different models/ideas (which still synergize together - men/women, console/personal computing, air/dirt, 0 and 1). So, in that moment you say 1, you are not only harming the 0, but the whole system. Specifically about linux there are reasons why people use other platforms, maybe you should research in that, if your prime goal is not greed.
In the end, the greed logic is the archenemy of development and progress for humanity, from the simple fact that the most safe bet isn't always the best one. But I also have my doubts that a greed-based developers will do any good anyway. But what I can say definite - the "largest markershare" guys are living in the past, trailing the tail, which was laid out for them in the first place and which has no real relation to needs of real people.