Is There More Copyright Infringement In Pinterest Or Led Zeppelin II? My DMCA Takedown

I received two (2) identical emails this week from Pinterest. They were very professional, respectful and kindly. Because the emails were in accordance with the Digital Millennium Copyright Act, one shouldn't expect adjectives such as professional, respectful and kindly but they were. I guess that's just how Pinterest is - the kinder, gentler hub for copyright infringement. The softer side of federal law enforcement.