unbound is a software that you can run anywhere to have a caching dns. opennic is a project of dns servers you can connect to to resolve dns records (think in google dns servers but run by the community). two different problem spaces. you can even use both at the same time

capitalism (or at least the weird version of it used in the tech world) is about short term profit. if they get good numbers from this, they can make future projections of an imaginary increase over the years and make the ad companies happy for a while. they do not care about breaking the product in the long term