I have tried hard to use Screencast but there are many reasons why it doesn't work for me (poor resolution videos, audio sync issues, incompatibility with android, causes the camera light on my Thinkpad to stay on, random sign in issues, etc). Since there appears to be no way to stop it from starting along with Fusion 360, my normal startup routine for Fusion 360 is to immediately go to the MacOS menu bar and choose Quit from the Screencast icon there. I sometimes accidentally hit the Screencast icon when I'm in Fusion 360 and it starts up again. Fusion 360 is very resource hungry and I don't need to feed Screencast as well. Please allow those of us that use other screencast software on Windows and MacOS to uninstall Autodesk Screencast.