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Photobucket isn't to be used because they have a low bandwidth limit and if it gets exceeded then you see this annoying image saying so. Personally, I'm not going to say anything if I see Photobucket or Flickr being used, but technically it is against the rules.
Plus, a lot of people don't bother to rehost the image on their own account and just post it still in some random persons account which is just going to add to the bandwidth problem.