It's a good analog, but doesn't mention a credit card as a hard-dependency :p
With all seriousness, I'm sure you're working on a swell tool. I also understand how difficult it is writing confident ad copy. This still sends the wrong message though, and I'm afraid you're going to get a lot of users belly-laughing at a Git comparison for non-GPL software. That's my only real comment on the thing.
Good luck with your service otherwise!
