What it means
Apps cannot use web pixels. An MMP sits in your app via an SDK and becomes the single source of truth: which network drove each install, what users did afterwards, and which campaigns produced revenue — deduplicated across Meta, TikTok, Google, and ad networks that all claim the same install.
Why it matters
Without an MMP you cannot fairly compare channels or measure post-install value, and with Apple''s SKAdNetwork/ATT privacy framework, attribution gets even harder. For any app spending real money on UA, an MMP is non-negotiable infrastructure.