The Funnel Math: If 1,000 Watch YouTube, 100 Read Substack, 10 Visit GitLab

Hypothetical funnel math: 1,000 YouTube views → 100 Substack reads (10% conversion) → 10 GitLab visits (10% of Substack readers). At those rates, the cascade needs large top-of-funnel volume to produce meaningful deep-funnel engagement. Currently: YouTube has near-zero comments (top-of-funnel cold), Substack has approximately 1,897 subscribers (middle-funnel warm), GitLab has unknown visitors (deep-funnel unknown). The funnel exists conceptually but hasn't been validated with real traffic data.