WebM is just an pointless nuisance. The world already has a open, video standard that is widely supported, technically superior and stewarded by a wide array of competing companies. And it's only royalty free because nobody can be bothered to sue them yet. It definitely is patent encumbered (see MPEG-LA's recent 'gift' of patents to VP8).
SPDY was another technology that was developed by Google unilaterally instead of working through the existing IETF process. If Google didn't own Chrome it simply would have never taken of.
And the fact that SPDY was developed unilaterally doesn't take away from Google's generosity in making it available to the world. It's generally well-regarded, and Google haven't attempted to limit it's use by other browsers in any way - much the opposite. Can you imagine Microsoft doing the same when they were the dominant browser?
Again, I'm not saying they introduced either of these technologies from pure altruism. But I am saying I'm glad they exist, and Google's approach to IP is a welcome breath of fresh air (so far).
If they'd turn evil over night or just stop existing, we'd still have a big net positive left. Not something that can be said for some competitors.