Your question is Estimate Southeast Asia Market Size. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
How would you estimate the size of the app promotional market in Southeast Asia?
Clarify what counts as app promotion, such as paid user acquisition, app-store advertising, influencer marketing, and performance campaigns. Explain the assumptions, data sources, segmentation, and cross-checks you would use to produce an annual market estimate. You may use illustrative assumptions, but distinguish clearly between known facts and estimates.