Umm, I'm assuming you're not aware that it isn't illegal to host container images for pirating software, or Even to have it actively running. What's illegal is obtaining copyrighted content.
Discussing piracy is most definitely not illegal in the US. It's protected by the first amendment, and there aren't laws that even try to restrict it.
The only part of the DMCA that really has any complexity is the anti-circumvention bit, and that has no relevance anywhere to discussing piracy or tools that can be used for piracy.