We could of course try to play the same game as Apple and create thousand of useless apps (apps that are just a shorcut to "evince /path/author-title.pdf" for example), but I don't think it would lead to success. Only Apple has this strange power to generate enthousiasm with stupid/useless things, many times I've thought that if any other company has done the same thing, everybody would have laughed at them). The only way to fight them is to break their marketing strategy so that people realize how crappy are all these appstores.