I'd be more concerned if everything they were releasing wasn't open-source but it is. So we can all see what Google is doing, if it was closed source we would have the right to worry that they're putting in some backdoor to silently and quickly take over the world.
So far I don't mind Google taking over the world.
thats how they start, first they say oh no look we have no secrets here at google. so everyone likes em, and soon you'll see. oh we just need to close this one a tiny bit, just so your computer will be safe :). and everyone is like ok google we trust you, and little by little google has more secrets and more until it's just like our current government (now called gogglement) and finally, well i think you know where i'm going with this...
i'm writing this using google chrome and hell yes will i try that os out. YAY GOOGLE!