Sanctions are the wrong way to go
Sanctions should only imposed when a clear induction of wrong doing is done before the offence is caused.
Google is very much in the same position as Microsoft, one rule for them and another for the rest. Did Google leverage its dominant position to ensure its other products succeed? Yes. Do other companies without a dominant position use the same tactics? Of course.
If the practice is illegal it should be illegal for all parties irrespective of performance otherwise you're stating its illegal to be successful.