Are you implying people wouldn't jump to SteamOS if it met the needs of gamers? If 95% of Steam games ran on it that would be a huge thing. Lots of people don't want to run Windows 10 because of privacy issues (maybe not a huge number, but it's likely a larger portion of gaming enthusiasts fit into that group than the population at large). And is there a better value proposition than free? If it meets your needs and costs nothing, why would you pay for an equivalent product?
Well, i guess you do have a point there - one iteration was worse in terms of privacy than the other, yet the adoption of alternative OSs was very weak.
But they've gone a little too far with Windows 10 - for me at least, of course everyone will have their own "measure" where too much will be too much.
