Apple and Google were legitimately more competitive in digital music and web search/web advertising respectively without government intervention. They would also both go on to wreck Microsoft’s WinCE business under all of its various names and guises on both the high end and the low end. SanDisk and Yahoo were their biggest competitors in music and web services during this time. Microsoft’s attempts to purchase Yahoo were rebuffed by Yahoo management’s overvaluation of themselves.
Your premise for this alternate history is flawed.
I stand by my statement: this isn’t the government’s problem, any government’s problem, and especially not any American government’s problem.