the publisher is the business of spitting ink on paper. you should be more unsettled by being MITM'd by data mining companies whose job it is to change behavior via ads or other consensus-building tools.
I might not do this if I were a high public official or celebrity on the off-chance that someone in the printing and packaging chain might happen to notice. But, for an average person, it seems pretty harmless. (Personally, the last thing I need is more paper but I get the attraction.)