A lovely gesture and indicates why they have been such a success...customer care.
Brewdog are complete arseholes with good PR. I say that as someone from Aberdeen who used to like having a local company doing so well.
There was the time they removed the disabled toilet from their flagship bar in Aberdeen to make more room (but were forced to put it back in by the council) Then there was the time they sued a pub in Wolverhampton I think, for being called Lone Wolf, which is the name of Brewdogs spirits division, despite the fact they had used the name for far longer. Then there was the time they tried to bully Aberdeenshire Council into selling them land on the cheap, threatening to cancel expansion plans if they didn't. There are more stories like this, all while claiming to be punks.....
The one good thing they have got going for them is they make in my opinion the only non alcoholic beer that actaully tastes nice (Nanny State). Every other one I have tried has been at best, just about drinkable.
Check out Fierce Beer, Brewmeister or Deeside Brewery if you want good beer from Aberdeenshire that isn't made by a bunch of twats.