explains why HBO would be in legal trouble if they tried to use the US DMCA to stop a trademark infringement. Because DMCA is for _copyright infringement_ only. (Headline: Using a DMCA takedown notice to assert a trademark claim may lead to section 512(f) liability).
Well fine, but they did anyway and were successful. This is the problem with the DMCA and far too complex legal crud: it's enough to scare people, which is all they need. A legal system which can be abused by those with the largest wallets without any noticeable consequences does not provide justice, and that's exactly what is happening.