Under some laws 'significant market power' might be a level that triggers scrutiny of competitive behaviour. Google would reach that level for search, advertising and Android at the very least in my view.
If you consider the market for mobile phone/tablet OSes available to OEMs the market is really Android and Windows Mobile and Androids market share may lead it to be regarded as a monopoly. I think that they need to be (and probably are) VERY careful in their behaviour in relation to all the phone manufacturers.
Please note I am making no accusation of anti-competitive behaviour by Google but I do believe that they will fall under competition law in several markets so they are not generally immune from such accusations.
If you consider the market for mobile phone/tablet OSes available to OEMs the market is really Android and Windows Mobile and Androids market share may lead it to be regarded as a monopoly. I think that they need to be (and probably are) VERY careful in their behaviour in relation to all the phone manufacturers.
Please note I am making no accusation of anti-competitive behaviour by Google but I do believe that they will fall under competition law in several markets so they are not generally immune from such accusations.