EDIT: In more detail to above.
Freely in it’s current form is available on Hisense & Bush TV’s. It was announce last year that a set-top box was coming. One is still planned however, BBC is now considering a dedicated Freely device, which could see them ditch Freeview. In my view they won’t be ditching Freeview untill licences run out as explained above.
More details here: https://www.cordbusters.co.uk/bbc-hinting-freely-box-end-freeview-era/