Google Ads is a separate division with separate policies, separate payment infrastructure, and separate fraud detection systems. Don't try and make sense of it; it's inscrutable on purpose.
(They're trying to grow a second revenue generator — GCP — but it's not been the success they've hoped; especially compared to Azure. Microsoft had the B2B relationships already in place, while Google has mostly been a B2C company, so they've been struggling to win clients.)