Flathub remote is set with a "filtered" option

When I use GNOME Software to enable the Flathub remote, it’s added with the filtered option.

$ flatpak remotes
Name    Options
flathub system,filtered

Is it really a filtered collection of apps? I don’t know how to test this.

Fedora Workstation 44

The flathub remote is defined as to allow filters to be set by the user. However, no filters are set by default:

$ flatpak remotes --columns=name,options,filter
Name    Options         Filter
fedora  system,oci      -
flathub system,filtered /usr/share/flatpak/fedora-flathub.filter

$ cat /usr/share/flatpak/fedora-flathub.filter
# Unfiltered