I thought this was common knowledge by now. The PR people write it, CEOs only give their ok.
Edit: All the statements being so similar is a testament to very shoddy PR work but it’s not all that surprising. The same PR people (well, very likely a single person) from Google who wanted to get statements from the all presidents and CEOs just called up the PR departments of all the companies and asked for statements, suggesting, along the way, the language: “Hi, this is Michael from Google. As you know we will very soon acquire Motorola and it would be very nice if we could get a short one sentence statement from your CEO about that, you know, to show your and our shareholders and customers how committed we are to the Android ecosystem. I can send you an email with an example statement to give you an idea about the length. Would that be alright?”
This is how large-scale communications works - you write your message, come up with quotes that support your message, get them OK'ed by stakeholders, and send them out. If you ever see a media release that doesn't come from a speech, and it includes quotes from anyone, you can bet they never actually said those things - someone from PR wrote them, and got them OKed to have been considered said.
Put it another way, the first time the CEOs quoted ever saw what they "said" was probably when they read this page
That’s why I was thinking that Google gave them some talking points and they got oddly similar sounding statements back and didn’t really bother changing them afterwards.