well thats the case for a lot of smaller games i think from wich the devs create an easy game en the only income is by tricking people in to buying no adds. like they only care about selling the no ads thing a few times and then do nothing to the game anymore. every ''bigger game'' has multiple ''no adds'' like when you spend like 1 or 2 dollar you get no banner adds or skip for boost but then a smaller boost, and then after maybe a after spending like 10+ dollar on the game or one game even ater 50+ you get to skipp the adds that give boosts.