I rarely uninstall software from my Mac. And unless the software is nice enough to provide a clear 'Uninstall' flow, it is not straightforward how to do it. In fact, it probably varies quite a bit from app to app.
In the case of LogiTech's G Hub, I was able to find the following instructions
for uninstalling it. The thing of note is that the updater app can take an
--uninstall flag.
sudo /Applications/lghub.app/Contents/MacOS/lghub_updater.app/Contents/MacOS/lghub_updater --uninstallI still had to remove the app launcher from my Applications directory.