Do you know that they were invited and declined?
is it possible that no one asked them to join, or declined to let them join?
Wouldn't they be liable for every song, every photo, every video, every document their users store? Maybe they've got songs (mostly) covered via the agreements for iTunes Match, but the rest seem hard to pull off (especially since, IIRC, taking a picture (or video) of a copyrighted painting, sculpture, etc. can be infringement in some cases).
Google, on the other hand, doesn't make anything that can be counterfeited, so they have nothing to gain from this bill. They do have a lot to lose (with all the censorship provisions), so they are taking a stand against the bill.
The lost-income argument of this needs to be battled, because I doubt that everyone buying fake rolexes at $200 each is going to be saving up for the real deal. I have to assume that the same type of arguments are propping up this debate. I want to know where the people that support this get these numbers from. Do people really think that by passing this legislation we will somehow get money for nothing?
Does anyone really think that this won't be applied to Wikileaks and the like...
FTFY.
They may never use that power, but it would certainly make negotiating much easier.