I mean, sure bury a time capsule on earth, it's cool for the kids and stuff and we can all reminisce about the good old days when you open it up but it just seems like such a waste to send one all the way to the moon as a PR stunt.
It gets worse when they explain it, it sounds like a scam: "His idea is to charge people £50 or so to place a sample of their DNA, in the form of a strand of hair, in an archive to be buried on the moon,..."
And then: "The catch? He needs at least 10 million earthlings to do this if he's to generate the £500 million the moon shot will need."
I mean, I'm sure you can chop up strands of hair pretty finely and he probably doesn't plan on generating £500 million through the time capsule but you can only fit so many of them on a moon probe while keeping costs realistic. Just from an engineering point of view, imagine trying to chop up 50 000 hair strand as finely as possible. Do you A: Develop a machine to do it / B: Rely on people to chop them and do their best to make the smallest possible cut. Then don't even get me started on the really careful manipulation involved to not lose one of those super small cut of hair.