Erm, seriously would you feel comfortable sitting in somebody's car who you don't know the name of? Sure you have his reg, but even then how would you know it's not some crook who stole the car and is about to kidnap you?
That's where all the fun is though..
Err no thanks, I'd rather have them do some id checks n what not before I use it. I know crypto is all about being free and anonymous but that doesn't work here.
Would you trust your wife to use this knowing absolutely anybody could be behind the wheel?