mastodon.ar.al is one of the many independent Mastodon servers you can use to participate in the fediverse.
This is my personal fediverse server.

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Aral Balkan

Just like you don’t have to use git with GitHub, you don’t have to use Flatpak with Flathub or your distribution’s app store. You can host Flatpak repositories yourself.

This is an excellent short tutorial showing you how: blogs.gnome.org/alexl/2017/02/

blogs.gnome.orgMaintaining a flatpak repository – Alexander Larsson

* Note: if you get an error about the freedesktop SDK or platform not being installed, you’ll have to install them manually. See docs.flatpak.org/en/latest/fir

docs.flatpak.orgBuilding your first Flatpak — Flatpak documentation

* Also, your flatpak install command will require sudo when run with a remote added with flatpak remote-add --no-gpg-verify (don’t do this in production, it’s just part of the tutorial to get you started, after which the tutorial shows you how to generate GPG keys, etc.)