I run paid media for two kinds of business. Shopify and DTC brands selling online, and local and home services companies that live on booked appointments. Mostly Meta, with Google alongside it where it earns its place.
Then I fix the conversion tracking underneath it, so the numbers you are optimizing against are true. Over $100M in ad spend so far, for brands including Purina and Mars Wrigley.
Before consulting I was a VP at the Boston Celtics and then at UFC, and I worked at Meta. So I have sat on both sides of the auction, and I know what the platform tells you versus what it knows.