This is some evidence that industry broadly views text ads as distinct from other search ads.
KINSHUK JERATH, Ph.D.[1]
Search advertising is one of the world's greatest business models ever created
Mike Roszak[2]
They refer to two distinct products.
KINSHUK JERATH, Ph.D.[1]
Advertisers today are better off than they've ever been in terms of the array of ads that they can buy.
MR. SCHMIDTLEIN[4]
And here also, they're saying search ads and display ads are not seen as substitutable.
KINSHUK JERATH, Ph.D.[1]
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