Option 1: When you go to their website for the flathub link, it takes you to a download for a .flatpakref file. Dowload that and run it. It will open the Software Manager to the gopher64 entry. If it isn’t opening with the software manager for some reason, tell it to open .flatpakref files with the Software Manager.
Option 2: Search for gopher64 in the Software Manager.















I believe the FairPhone is pretty solid.
Not as good, but Apple stuff is a big step up from Google and Samsung stuff wrt spying.