It's being done for the same reason you get spam ads and commercials in general. even if you hate it the fact that it exists has been entered into your brain. Even if you forgot about it completely your subconscious will still retain the name/image and whatnot. So no matter how badly it pisses you off you're actually more likely to buy the advertised product if you had to choose between a non advertised product and an advertised one.
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