Google App Campaigns operate as fully automated black boxes. You don't control creative combinations, placement selection, or bidding adjustments manually. The algorithm handles everything based on one input: conversion signals. Without conversion tracking, the campaign has no feedback loop. It can't distinguish between a user who installs your app and immediately deletes it versus one who completes a purchase or subscribes. You're essentially paying for vanity installs that generate zero revenue. Conversion events tell Google which user actions matter. For most app campaigns, that means tracking beyond the install—registration completions, first purchases, subscription starts, level achievements in games, or trial-to-paid upgrades. When you feed these events back through Firebase or the Google Ads SDK, the algorithm shifts spend toward placements, audiences, and creative variants that drive those specific actions. A campaign optimizing for "in-app purchase" will attract fundamentally different users than one optimizing for "install volume," often at 3–5x higher cost per install but with 10–20x better lifetime value. The financial impact is direct. We've seen app campaigns without proper event tracking burn $2,000–5,000 CAD per month on users who never engage past the welcome screen. Once conversion tracking goes live and the algorithm gets 50–100 conversions to learn from, cost per valuable action typically drops 40–60% within two weeks as the system identifies patterns in user quality. Implementation requires Firebase for Android and iOS or the Google Ads SDK integrated into your app build. You must define conversion events that align with actual business value—not just vanity metrics like "app open." For e-commerce apps, track add-to-cart and purchase. For SaaS, track trial starts and upgrades. For content apps, track subscription conversions. The algorithm needs at least 10 conversions per day per campaign to optimize effectively; below that threshold, performance stays erratic. Without conversion tracking, you're flying blind with a $50–500 daily budget at stake.