sfaik Footlocker didn't make a conscious decision to burn their building down, nor do they turn up on this fine community oriented forum to regularly post spam promoting their business. The same goes for all the other things people have mentioned that irk them more than these adbikes (plural) and the blackboard that blocks the pavement.
I know the editor is happy for that particular business (and only that one business) to use his boards for regular free advertising despite the fact that they never, ever post anything but spam. That's his call.
From my point of view, however, this is an open thread and as I know that Londonfarmers post here it seems the obvious place to ask them to explain their antisocial behaviour. Of course, if the editor objects to me using his boards to question them I will, of course, desist.