Exploitation at its best
I can't believe A-d-i-d-a-s is doing this. come on, A-d-i-d-a-s...we all know that asking for such cheap services when you do not come from a registered non-profitable/charity organisation is downright unprofessional. It blatantly means that the event is not really important so any photographer can just 'volunteer'. If they think this event is too easy to shoot, why don't they just ask anyone working with them to shoot?
I know beginners have to start somewhere but some t&c will require the photographer to lose the rights to his/her pictures and the photographer will have to consider that carefully. Is your passion worth only that much?