YouTube Music Snap app message?
Solution 1:
The internet is currently pretty silent about this, but it seems to be an issue related to snap, not ytmd. I've found a few similar issues related to other snap apps giving the same message on startup.
My solution: uninstall the snap app and download the app image from the creator's website.
https://ytmdesktop.app/#download
Make sure the file is executable. (chmod +x filename)
If you want this to be treated like an application(search, pin to dock, etc..), create a new file: ~/.local/share/applications/ytmd.desktop.
I followed this article and used the icon from the ytmd github repo. Works just as well (better since there is no pop-up) as the snap installation.