With the recent major advancements of Linux phones and tablets and convergence becoming a reality, I was wondering:

How to make a living creating (FOSS) apps for Linux, whether it be for the Desktop or the phones?

Are in-app subscriptions the only way? As the usual distribution channels (repositories and 'App Stores') seems not to provide a straightforward way to sell software.

Edit:

Thank you all,I think I have my answer now:

• The easiest way seems to distribute the apps through usual channels (flatpak / repo) and sell a license key
• and are working on paid apps
• There is also the Ubuntu store, Steam and itch