Who is this for?
This project is targeting two kinds of people: Those who can vote but hadn't planned to, and those who can't.
There are many reasons people can't vote, and any of them are valid reasons to participate in this project: a criminal record that disenfranchises you, immigration status, age, lack of ID in a state with voter ID laws, &c.
As for people who would otherwise not be voting, they may think their vote doesn't matter, they may disapprove of the parties or the candidates, they may think the whole system is so irredeemable that the most moral thing is to abstain, or they may simply not care enough to go through the rigamarole.
If you're on the fence about voting, or just kind of apathetic about it (like, "I know I should, but I don't know if I'll get around to it") you can think of signing up as a way to feel accountable, and to vote in a way that even if it doesn't feel personally meangingful to you, would feel tremendously meaningful to someone else.