Feed quality ignored
The US Shopping market is crowded. Thousands of brands are bidding on the same product categories, and Google uses feed data quality as a tiebreaker when bid alone does not determine placement. Titles that read like internal SKU names, missing attributes, and generic product type taxonomy all reduce your auction eligibility and increase effective CPCs. In the US market, feed engineering is not optional — it is what separates accounts that scale from accounts that stall.