How do I stop the Adobe Creative Cloud app from auto-launching on login?

It is loaded by default by /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist.

If you run

launchctl unload -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist

that will disable it for your user.

To turn it back on

launchctl load -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist
One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.