Nintendo 0%

Doubtful. These numbers provided are completely wrong. Back when files were leaked during this very trial, Epic revealed they had 3 to 4 times more players on Playstations than Xboxes everywhere other than the US.

Accorsing to Statista (accesible on a third party site if you want to avoid registring), Xbox only has 23% of the market (as opposee to PS's 45% and Nintendo's 27%).

I don't like Microsoft, and I agree sideloading should be a thing on consoles too, but they definitely do not hold a majority of the console market, let alone a monopoly.