paid/open: vulnerable to a race to the bottom as the open alternatives undercut each other on price
IOW it's good for the customer right up until the One True Product is shut down, or there's no viable business model anymore.
The risk seems to be more in the camp of the company. If it's open, someone could undercut them more easily than if it was closed. So the onus is placed more on the ability of the company to continually add value through services or the kind of innovation that led to the product in the first place, rather than just protecting their IP.