To the community

"Doesn't open source mean they have to "give back" to the community?"

Morally, sure. Legally, not necessarily. The GPL only demands that you give the source code *that you distribute*. Since Google only uses it internally, and does not give their modified binaries to anybody, they are not legally obliged to give anybody the source code, or tell them what they modified, if anything, to begin with.

But it would sure be nicer if they did give these modifications to the community nonetheless (I suspect they do contribute something, but I haven't checked), in case they are of use to other people. I mean, they built their multi-billion dollar business off of this free stuff the unimaginative pundits keep saying is no good; it would be nice to give mods back out of gratitude, if nothing else. Oh my, I'm wishing for moral businesses, what a fool I am...