I'm sure Parse has a great team at it's disposal, but once they were purchased by Facebook I wrote them off completely. Absolute last company I want to trust with the system critical infrastructure for my apps is Facebook.
Facebook infrastructure and systems teams are the best I've ever seen, assembled from some of the other best teams I've ever seen.
Or perhaps you're concerned about Facebook changing the business of Parse or shutting it down? They went out of their way to disclaim that when they did the MA, so I would worry about your own business long before I worried about Parse being the reason you win or fail.
