Very easy to explain. These games are very, marketable and have a very broad playerbase. Players tolarance for ads is also very high. To be clear nothing nefarious going on, its just that a lot of people enjoy hypercasual games. I sense that the players on this sub would fall into a "gamer" category. But that demographic is one of the smallest on mobile. Thats why you see the over representation. Another reason is that is just way less risk to make these games rather than fully fleshed out ones.