I filed a DCMA takedown request in March this year to get a site removed that was using a 2 year old copy of my site. Over 1000 pages.
It was successfully removed.
Traffic is really low at present, so started investigating and 2 days ago I found the same site back in Google's results and ranking higher than my pages for "phrases".
Filed another DMCA and also contacted hosting company who have taken the offending site.
Do DMCA takedown's expire after a few months?