If you get an Android TV you can modify it to be ad-free and run pretty much every app you need. Sony TVs use Android TV

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It runs all the time and launches during boot. A ring0 anticheat that only runs while the game is running would be even more pointless

except that manufacturers account for that and calibrate such that what you think are 0 and 100% are actually closer to 20 and 80% respectively.

It’s actually the other way around. A safe cutoff voltage to prevent battery degradation is about 4.2V, but most modern phones charge until 4.45V, so they can advertise a bigger battery capacity at the cost of long term battery health. Your phone essentially charges itself to more than 100%