Using the eBooks Tree complaints page probably doesn't go anywhere anyway; they say they're fully DMCA compliant, which is a complete planetload of bullshit or why would they steal so many random works by people who are ((let's face it) unknown outside of fandom - all the stuff I know of apart from the profic that's been stolen was put up under various fannish pseuds. And people who know who these people are and what they write will know where they can find those works without paying for the privilege of reading them.