Google robots don't have a clue on how to interpret the use of trademarks in ads. If the trademark words appear they are restricted so your ads do not show even though this is not correct interpretation of trademark law. If you use a trademark as an application, this is ok, legal and the ad should not be restricted. If you use of the trademark in a way that implies the part is a trademark part the ad should be restricted. We have had an on going issue with Google for years over this. This is basically a restraint of trade by their robot and the humans that may have reviewed our ads. Every car make in the world has registered their name and models as a trademark. If a person doesn't own a particular car model they have no use for our product. The only way we can tell a person about our product is to tell them what the application is. Google's misinterpretation of trademark law kills all our search ads.
I don't quite understand what you mean by "applications", but I'm certain: the legal aspects of trademarks were scrutinized and deeply checked from every angle, by the best trademark lawyers before Google set this policy (based on which the bots and human specialists review the ad).
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Re: Trademark use
I understand you don't understand trademark law but your answer is not correct. When you say for example "car mats for a Ford Falcon" this is ok even though Ford is a trademark, however, when you say "Ford car mats" this is incorrect because it implies that the car mats are made by Ford and you can't say that because your car mats are not Ford products unless you actually buy the car mats from Ford and resell them.
If fact I will give you another circumstance where the robot and/or human is not even investigating correct. We have ads rejected for "RACING DYNAMICS" which is a trademark that we actually own and have registered. We can't even get Google personnel to check their facts.