A per-user license, though, can be a PowerApps license, right?
Also, the reason I'm asking about the Model-Driven or Canvas is I'm wondering if a PowerApps-only licensed user can launch an app inside the D365 mobile app, or if they have to use the PowerApps app. If they have to use the PowerApps app, then it's my understanding the app would have to be built as a Canvas app....
Per MS documentation, "Model-driven apps don't run in the Power Apps mobile app. Instead, you run a model-driven app on a mobile device using the Dynamics 365 mobile app."