How to remove Skype menu bar icon from macOS?
Since Skype 8 is an Electron app you can modify its source code. Run this command in Terminal:
LC_ALL=C sed -i '' -e &quot;s/this\._tray=new i\.Tray(this\._getTrayIconInternal()),/\/\*is\._tray=new i\.Tray(this\._getTrayIconInternal()\*\//&quot; -e &quot;s/initTrayMenu(){.\{7\}/initTrayMenu(){return;/&quot; /Applications/Skype.app/Contents/Resources/app.asar

It will prevent the menu bar icon from being created.