There's a big difference between competing with another business in a market on a level playing field (e.g. Android vs iPhone) and essentially deciding to ban a

There's a big difference between competing with another business in a market on a level playing field (e.g. Android vs iPhone) and essentially deciding to ban another company in a sector from competing with you (e.g. Admob vs iAd). I think the prior is fair game, whereas the latter is anticompetitive (even as retribution for daring to compete on a level playing field).