Bump.com hopes that this video entices you to sign up for their service, tying your cell phone number to your vehicle's license plate. Please don't be stupid enough to fall for it.
First of all, if you see a baby left alone in a car, you should call the police...not send a text message to the parent guilty of child neglect that is putting that baby's life in danger.
And sending a text to the jerk in front of you to give him a piece of your mind for his bad driving is a really BAD idea. It just encourages road rage, which can have deadly consequences.
Reporting a break-in in progress to the owner of a vehicle instead of snapping a photo of the criminal & calling the police, can result in the possible injury or death of the owner of that vehicle if they should come running out and confront the criminal. You do not know if they are armed and dangerous.
And marketing? That's not marketing...that's spamming. It won't take long before you decide to change your phone number and/or plates, if this crap becomes popular. You'll have to, to get any kind of peace. It won't take very long for someone to start collecting license plate numbers and selling them to the highest bidder. The potential for abuse here is seriously high...worse than email because a license plate number is a whole lot easier to get than an email address.
If you want everyone in the world to be able to send you any kind of message they please, whenever they want, including some of the most vulgar filth imaginable, then just put your cell phone number on a bumper sticker and/or wear it on a T-shirt...or perhaps write it on the wall of a public bathroom. (no, I don't think you'd really want to do that, but using BUMP is just about the same thing.)
Finally, as Gail Gardner from Growmap pointed out, this service conditions people to spy on their neighbors and complete strangers, eroding both our privacy and freedom.