Update: I want clear up a few things. As far as I’m aware all of the Dropship repositories and archives that were taken down was done so voluntarily. Dropbox never made threats, legal or otherwise. It appears the DMCA notice was automatically sent to me when the file was banned from public sharing. There was no real DMCA takedown issued. It was an edge case bug in their file removal system.
So, still stupid, but at least there's the possibility that it wasn't malice.