I believe that many major sites (e.g. Youtube) offer "DMCA-like" service where copyright holders send takedown requests that are not DMCA requests with all the

I believe that many major sites (e.g. Youtube) offer "DMCA-like" service where copyright holders send takedown requests that are not DMCA requests with all the associated requirements and legal consequences for the one who submits false claims. They don't have to honor DMCA-like-but-not-really requests, but they have chosen to do so.