The Krisp app (a noise filter for skype calls) starts automatically on boot, and even if I remove it from the list of startup items, I keep finding it there.
This is annoying and intrusive. I like the app and I need it, so I won't uninstall it just yet, but I'd like it to start when I want, not when it wants.
launchd
service (daemon) running that checks to make sure it's in your startup items (Spotify has something similar). Given that it's a 3rd party paid app (not affiliated with Skype or Apple/macOS) , have you contacted their support offering to see why they do this and if there's a setting to disable it? What did they advise?