Not enough gravity, the atmosphere will drift away from the planet with the help of solar winds etc. Too much gravity, and the ammount of fuel you need to leave the plannet weighs more than the rocket the fuel is being used to lift can carry.

Even in our current ships, most of the fuel used to leave orbit is really used to carry the other fuel you need later.

Im also confused. Do these people not have some sort of version control and backups? Even if the AI did it, no one has backups? Did the ai also delete the backups and repos? If the building burnt down, would they be in the same situation, it just wouldnt make it to the news?

Dont know of i remember this right. But didnt the FBI have the statement on his death written the day before or something?