Ask HN: What are the real reason(s) behind Google killing Notifier?

Just wondering if anyone with insider knowledge could shed some light. Is it a ploy to push more people to Chrome (the announcement page suggests Chrome-only alternatives)? Still experiencing withdrawal and amidst a geekly #whyMustIcry moment, I wondered what really instigated this move. ...If Yahoo pulls a similar move and kills Yahoo Pipes, I'm really going to lose my shit.