Amazon's cloud and ad divisions are key contributors to its record profit. But the tech giant keeps the full picture murky.

Hai Mag is the cofounder and CEO of Eva, an AI-Powered Retail Media platform and marketing agency for brands. The Amazon marketplace is more competitive and complex than ever, but I see plenty of ...

And that murkiness leaves unanswered the question of just how much profit comes from one of Amazon's thornier business practices: Increasing the fees on the millions of independent sellers who are ...