You don't think Google is *intensely* interested in the outcome of cases regarding uploads of copyrighted materials to online sharing services, given that they own & operate sites intended for sharing, and which can - easily & trivially - be used to share copyrighted content?
In the US, all content is copyrighted. From the funny photo your mother took of you as a young child in a compromising position, to the book report you wrote in 5th grade, all the way up to the recording of you drunkenly beat boxing at the St Patty's Day party last weekend your frienemy took and shared on the Facebook. Of course all these sharing services are used to share copyrighted content. All content is copyrighted.
The problem is the RIAA and the MPAA and their similes want consumers, content creators, and governments to believe that they are the sole Lords of Copyright. That if a work is copyrighted, then by definition it belongs to them. And since it belongs to them, then only they may distribute it and it may only be distributed how they intend it to be distributed and you must pay them for the privilege. Because if you don't, they will attempt to sue you for damages many times larger than the entire planet's GDP and win.
This includes that picture your mom took of you because you were wearing Micky Mouse underwear, the book report your wrote because Jurassic Park is a major motion picture, and the drunken beat boxing video because the RIAA has every beat that could possibly be created copyrighted multiple times over.
Statements like yours proves that they are winning by a large margin and it is very frustrating.
Google, hotfile, etc's interests are only in wanting to be another competitor in the distribution of content and they are doing it and no cost for the content creators. The RIAA and MPAA cannot compete with free. If they can win against a little guy like hotfile or get the United States government to close down Megaupload (didn't they have a commercial where content creator's were singing how they enjoyed using it?) then they can get rid of Google or more likely convince them that giving them an insanely large cut of their revenue like they get on blank CD/DVDs.