If Windows isn't the gold standard having 70% of the market, then what is? Azure is in second place not by far after AWS. And these are huge, HUGE markets. I wouldn't say your local grocer is dead because it's not Costco, and of course by this logic Costco is itself dead because it's not Walmart.
Maybe we are jumping the gun on Windows. My echo chamber is tech people and they seemed to have lost faith in windows after they Windows 11 introduced ads and plugged every hole that allowed to bypass needing a Microsoft account. Gaming and anti-cheat not working on Linux will keep that market share high for a while.