I am guessing you used to donate ? (back in the days when it was 50% off for all) if so or if you was in a police group you wouldn't have seen it.
Its not full advertising just making people aware about the donations, if we fall short of donations then it will be replaced with google/amazon ads (something i wouldnt want to do)
Its also never been removed from the donator perks - http://www.altislife.co.uk/donations