Microsoft and Google: The Cloud Lead That Keeps ShrinkingThin moat

AWS invented this market and still leads it, holding roughly 28% of global cloud infrastructure against Azure's 21% and Google Cloud's 15%¹. The uncomfortable part is the derivative: AWS has been growing more slowly than both challengers for several years, which means the lead shrinks every quarter even when AWS has a good one.

The reasons are structural rather than technical. Microsoft reaches enterprises through agreements they were renewing anyway; Google arrived late but owns frontier AI models and its own accelerator silicon, which turned out to matter more than anyone expected in an AI-driven buying cycle. AWS's counter has been its own silicon — Trainium and Inferentia — and the argument that it remains the most complete and operationally proven platform, which for a bank or a hospital is not a small thing.

This rivalry is treated at greater length as one of Amazon's two root threats, so the short version belongs here: watch the growth rates rather than the shares. Share moves slowly and flatters the incumbent; growth is where the next decade's position is being decided, and AWS has been on the wrong side of that comparison for long enough that it can no longer be called a blip.