Media streaming: petabytes of video, billions of requests, zero margin for latency, razor-thin margins. Pro design: CloudFront edge + S3 Intelligent-Tiering (warm→cold after 30 days), EMR/Redshift for real-time analytics, Lambda for thumbnail generation, S3 event notifications.
Core: Performance (latency<100ms) and Cost (margin<10%) compete. Win via archival automation and regional edge caching.