Zombie Age 3 – WHY are there SOOO many advertisements for JUST enjoying the sport?

I used to play this sport as a baby and wished to strive it once more, however damnn after every degree theres an compelled Advert! If i wish to unlock a brand new gun, i would like to look at an Advert, if i wish to unlock a brand new character i nedd to look at an Advert!! Its a sport filled with advertisements, why is it like that? Was the sport all the time like this? And if i get premium Will there nonetheless be Advertisements?