In terms of "hacking" Android games and apps, I would say no one knows who was the first to modding games and apps because modding is like a recipe book, this book only teaches this much but the other book teaches more than that. And so in the community of modders, one person knows about one thing and then passes it on to another and the other learns more about other things while learning the "results" of the former then doing it again for others on the behind. Its a loop to exchange knowledge with each other and become a modder
As for the interesting part about this "hacking", I dont know much because it depends on the individual =) While this guy wants to speed up the progress of the game but the other wants to break the unfair "pay2win" wall or they simply just want to enjoy the game or app themselves without the headache of upgrading things