Absolutely. The server-side implementation of Snap is closed source and the Snap Store is a single instance controlled solely by Canonical. Flatpak repositories

Absolutely. The server-side implementation of Snap is closed source and the Snap Store is a single instance controlled solely by Canonical. Flatpak repositories are decentralized and can be hosted on private servers with flat-manager, which is FOSS: https://github.com/flatpak/flat-manager https://github.com/flatpak/flat-manager