Imagine you created your very first app. You developed the concept, workedtirelessly on the key features, design, tested it and fixed the bugs. Themoment has...
I don't even read this as allowing proprietary apps. They are investigating allowing different monetarisation methods for open source apps and building open source tooling to help with that.
When I'm talking about proprietary in this context, I don't mean closed source, I mean it as in the financial sense of not being copy-left, or under any sort of licence which permits free adoption of their code.