It's very possible that they never will, that instead the advertising will be so subtle nobody will be able to detect it. Including phrases similar to what products, brands, and their actual ads use in positive contexts, sentences that don't mention but make you think of products, being just slightly likely to bring a brand up than its competitor, and a tiny bit more critical of it, etc.
The goal isn't to have an ad->purchase, the goal is to make sure the purchase is more likely in the long term.
The goal isn't to have an ad->purchase, the goal is to make sure the purchase is more likely in the long term.