My son is eleven years old, a huge Minecraft fan, and is exactly like that. Now, he does know that MSFT makes Windows, but that's not an existential threat to him like ruining Minecraft is.

yes! i signed up for an account here just so i could say this. we got refurbished computers for my children just to play Minecraft. Minecraft didnt work in windows, so i set up a dual boot Ubuntu system (while biting my nails i might totally destroy the os), thatnwas working well for months. when they had to migrate their account, somehow it switched my daughter's local login to a Microsoft family login which screwed up her other apps (like adventure academy). im tearing my hair out trying to figure out how to switch it back to a local login. i already have two other apps for monitoring computer time (which already don't always work out as well as youd think, so i didnt want to really have to deal with a third one.) i guess ill eventually figure it out, but found this page looking for a solution. (and im not that techy right now, so it takes a good chunk of time.... sigh

wait until Microsoft starts screwing up Blizzard IP. Or, I guess, screwing it up more than Activision-Blizzard already did...