If it were teaching them history, philosophy, science, math, literature, etc. then maybe it'd be disconcerting. But these things seem more focused on algorithmic thinking, programming, maybe math (though not necessarily higher math), logic and a bit more.

MS produced tools, lots of people use them. MS didn't write the textbooks and explain to students that Windows was the be-all-end-all of operating systems, the rest are heathens.

A video game like this, to be successful, requires a well-structured volunteer base (hard), or profit. And it's hardly a monoculture, anyone who wants to put in the time and money is able to produce a competing game.