If you play videogames and actually pay money for them, you should sign.
Imagine you have a bike and the manufacturer turns some server off which leads to the bike becoming unusable. The bike itself, its parts, are fine. You could use it if it weren't for the "feature" they built in and decided to kill. This renders the bike unusable and it forces you to buy a new bike (for the sake of this example, imagine you can't take it apart and sell the parts, just as you can't take a game apart and sell its parts). All this petition wants is for us gamers to still be able to play a game even after they flip a switch somewhere. That's what it's about, as far as I understood.