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It's always been allowed as far as I know..
We used to use it for about 3-4 years back in the early to mid 2000's, at first it seemed worth it, but over time our sales results dropped and the prices seemed to go up, so we stopped using them. (Some of the words were going at ridiculous prices, not sure what it is like now for adult price-wise.... I can only imagine).
It is not allowed for adsense though.
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