We recently built a tool that allows us to ban links across the sytem (as of a few weeks ago) and I wasn't aware that a DMCA takedown email would be auto-generated and sent. This was a tool built for our support team and I'd never personally used it. That said, we feel strongly that the code is a violation of our TOS and don't believe the removal of the content from our site is censorship.
I'd also like to clarify that nobody's accounts were threatened: in every case my phrasing was as follows: 'I hope you can understand our position and can agree to remove the Dropship code'.