google chooses when and for what terms to serve ads
you have to deal with quality score etc etc
maybe they don't think your site relates to the keywords you are bidding on
what is your landing page quality score?
Usually your ad and landing page first get passed trough the bot to check compliance
then a bit later a reviewer will take a look. They have the ability to set your score manually and override the bot, I believe
There was a guy from Overture who said back then they would tweak their system and not show ads on cheaper keywords to drive marketers to bid on the more expensive ones
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