The lock screen and display manager are two separate pieces of software. The display manager runs before a user profile has been selected for graphical login, so it does not have access to your user desktop/display settings

I bought the game, tried to fly into the nearest star, and found out that it was just a part of the skybox. Immersion ruined :(

Free software licenses (e.g. GPL) allow repackaging and selling the works, they just also require that any of the ‘repackaging’ is also under a free software license. You can even sell someone a piece of free software without making any changes, nobody is going to buy it though because it can usually be found for free somewhere else.

Idk about the lack of repairability, those things are really easy and cheap to fix in my experience. They are at least no less repairable than 95% of laptops on the market.

No, part of the antitrust requirements would likely be them having to stay out of the browser market for a set number of years.