Currently Gnome Software allows the installation of Flatpak applications, it gets the flatpaks from Flathub: dl.flathub.org repo.
However Flathub seems to allows and distribute non-free applications.
Some examples of Flatpak applications with non free licenses that can be found in GNOME software and installed in PureOS are:
- Visual Studio Code
- Team Speak
Screenshots of these examples follow;