I think GG will eventually have the option to remove it's advertising and brand as your own, but since it's still in dev and not
able ready to actually create games yet, the advertising is there to increase sales and interest. I don't believe that any semi-serious developer would try to release a game made in an engine that's so early in development. As many others, I'm very confused about the direction of GG so I'll stick with classic as well. It may not be as refined or able as GG in the end, but it is complete and solid, ready to make a game, even if somewhat dated. More often than not, a great game is the result of the creator, and not the engine.
Brian.