I tried just this moment the Sunshine version from our Solus Software Center. And man, the the first launch was very strange. When I clicked on Sunshine it opens: Sunshine (yay) but also Steam, Heroic Launcher, KeePassXC, Onboard (Keyboard) and activates also the voice assistant.
After a reboot, cause it didn't know how to deactivate the annoying voice assistant, I launched sunshine via terminal, everything acts as it should be.
Checked with alacarte (menu manager) the launch command and I found my problem:
/usr/bin/env systemctl start --u sunshine