Potentially, but also potentially not. Your point is rock solid: Microsoft is pimping a strategy but it's not actually delivering on that strategy in full. However, like on Steam, every software purchase on Xbox or PlayStation, etc., is given a unique license that ties that game to your account. That license is actually the property of the platform holder, and the license specifics are their patented intellectual property. If I want to support a PlayStation game license on my platform - like, say, buying Indiana Jones on PlayStation lets me play it on my Xbox - then I need Sony's permission to implement their licensing system on my platform. I see no reason for PlayStation to have even developed support for this kind of external integration, let alone allow their competitor to implement such integration. Work-arounds - such as external licensing platforms - are prohibited. This is why digital currency purchases are made through the platform's store, like Xbox Store or PlayStation store, rather than through the software itself. There's wiggle room - like cross-platform progression - but it's locked down tight for a reason. For as much as I'm happy to shit on Microsoft, there's every chance Sony told them no.