I am one of the core maintainers of Ubuntu Touch at UBports and intend to move this to official UBports repos and the Snapcraft account when maturity has been reached.
It is mainly intended for creating a Lomiri Desktop based on Ubuntu Core, meaning the Core image would use this base by default to have a shell and some core components be part of the Core image.
I would have to peek into Ubuntu Core Desktop with GNOME or the KDE attempts to determine what other Snaps using this as a base would be viable options.
So, as this snap is not intended to be used as base for the general audience, we need a concrete list of snaps that should be allow to use it (so that we can flag other snaps trying to use it potentially wrongly).