There are currently ad libraries you link into your app, and I really have no idea what's in those libraries and what kind of stuff they send home. Which is the crux of the problem, really, and one of the things Apple is trying to address - we should know where we send the data and how it's being used, but individual developers are not powerful enough to affect change from ad provider. Apple is.

So anyway, since I don't know what these apps collect, I can't be certain if thy will be banned in short term. Obviously once they clean up their act they will be admitted, but the transition period may be messy, that's all I'm saying.