I think it is all down to geography.
There are 4 parties involved in the act of us watching a video advert to gain a reward.
1 Nordeus.
2 The Ad provider (Supersonic, Ad Colony, whoever.)
3 The product manufacturer.
4 Us.
So for example, a company, let's call it Worldwide Cola take up an offer from the Ad provider to place their adverts within the Top Eleven game. theoretically these ads could be seen worldwide (subject to individual countries advertising rules and regulations, ( these, we will never know. Or how much of a part they have to play in wether or not we can get adverts.)) Also perhaps Worldwide Cola don't want their adverts to be shown in Australia, for example. Why? Well because the Australian market has been cornered by Koala Kola. Worldwide Cola has no sales in Australia therefore no need to advertise. It's an invented example of what perhaps happens.
If due to advertising rules and regulations and if there are not enough manufactures who wish to advertise their products on the Top Eleven platform a Provider is unable to show adverts to Us everyone loses. Everyone of course who has the misfortune to live in the "wrong" geographical part of the world.