I just wish they'd help me when there's no copyright infringement at all, so there's no need for a "fair use" argument--but I still get an infringement notice.
This happens, for example, if I sit down at my own piano and record myself playing some unambiguously out-of-copyright work, for example Mozart, Chopin, or Bach.
Just last week I got a notice from a record label because their matching software identified a Beethoven piano piece as being that from one of their copyrighted recordings. It wasn't--it was me playing.
Google should stop allowing companies that do this access to their content match system.