Google Ads can still work for Amazon affiliates, but most profitable campaigns focus on high-buying-intent keywords and content-rich landing pages rather than direct linking.
Happens sometimes, could be Google update or competition. Try improving content, check backlinks, and promote it again, usually traffic slowly comes back.
I usually do one campaign per category, keeps CPA clean, and then use ad groups for each product. Lets smart bidding get enough data without mixing very different margins.
Im still running both. Standard Shopping gives me way more control and cleaner data, while PMAX is decent for scaling. I keep brand traffic separate too, otherwise PMAX tends to take credit for conversions it probably didnt create.
As far as i know there isnt any fixed threshold, Google can ask for business verification at different stages depending on account activity and risk signals.
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