Ever since iOS became ascendant I've been scared of a future like this - where the bulk of internet use is funneled through a small number of gatekeepers, doing an end run around the leveling power of the web. It's hard to put into words, but it's the fear that the "internet as we know it" - chaotic and untamed, or more importantly unruled - will evolve into something akin to TV before cable: more interactive, but still essentially a content delivery system for four or five corporations. That is, a thing that our grandkids will be free to consume, but not to create or improve.
It's funny - if a TV network had ever tried to sell people TVs that only played that network's shows it would have flopped, but iOS has proven that the principle can work if the experience is good enough, or the alternatives poor enough. I suppose it's all inevitable, and maybe some think what I'm worried about is already here, but I sure hope not.