BRAVO! The open source is an exceptionally shrewd, solid, STRONG business move ... basically demonstrates, in a compelling manner, a justifiable confidence on the part of founders and investors that the best is yet to come, ie company can solve much dicier problems for clients.
The beauty of this strategy is that simultaneously disrupts the business model of competitors who are now showing that they cannot compete and fear competing in the future. Those who rely upon the proprietary source business model often do so out of weakness, ie they need to keep things like this under proprietary lockdown because they lack an innovative culture to develop new talent and, accordingly, probably will never have a useful idea again.