They discontinue products that don't pan out and lose them money (like Chromecast Audio), and they improve features that detract from the user experience and muddy the waters in terms of ads/monetization in their view (YouTube annotations). They run their company as a constant stream of trial-and-error product launches, some of which succeed wildly and make them billions, others fail and are killed off. Makes sense to me.
Perhaps someone is confusing them with a charity or an Internet do-gooder enthusiasts club. That's unwise. You can be sure that successful services used by a lot of people will continue indefinitely, perhaps tweaked to generate more revenue. Otherwise, come on, as an avid Google+ user you must have known that the writing is on the wall for you and the other 500 avid Google+ users. No charities here.