What Google Consent Mode v2 Means for Cross-Channel Marketing Attribution
If your Google Ads and GA4 reports never seem to agree, you are not imagining it. The numbers are actually different — and the reason is not a tracking bug. It is a consent gap that most marketers do not even know exists. Here is what happens. When a user lands on your website and clicks "decline" on your cookie banner, every single Google tag goes dark for that session. No data flows into Google Ads. Nothing reaches GA4. That user's visit, click, and possible purchase simply vanishes from your reports. According to the UK's ICO, consent decline rates hit 30 to 40 percent on websites without an optimised consent experience. At that volume, you are not missing a few rows in a spreadsheet. You are making budget decisions on half your actual data. The knock-on effect is worse than most people expect. Google Ads, GA4, DV360, and YouTube each handle missing consent data differently. So instead of one consistent picture, you end up with four platforms producing four diff...