The fact that the pitch includes a swipe at Google shutting down services kind of invites the "yeah but are y'all a future acquihire?" counter-skepticism. I think they could probably just have left that whole subject out of the pitch; it's an approach to competing with Gmail via "negative advertising" that I think has relatively little upside and opens up a can of worms. (On the other hand, it's an obvious enough counter-swipe that I'm not sure it's helpful for the entire HN discussion to be about it.)