advertisers use celebrities that fit the size of their business. if your business is right now literally taking over the word and it is dependent on statements of presidents and top 10 billionaires in the world, then reese witherspoon does not really play in this league and chance she will make any noticable dent in its popularity or evaluation is astronomically low.

have you noticed that celebrities also have opinions and sometimes share them for free? when a celebrity speaks for war, are you asking "how much have you invested in military industrial complex?" when they speak against war, are you asking "how much have you invested in red cross?" when celebrity speaks about education, are you asking "have you recently invested in any private schools?"

not everything in the world is conspiracy.