You can create AI shorts for YouTube automation using a tool called Opus Clip. First, find a video that you want to make AI shorts of and copy the link of the video. Second, go into the Opus Clip dashboard and paste your link. Third, tell the tool to make AI shorts that are shorter than 60 seconds. Anything shorter than 60 seconds cannot be published as a short. You can use this tool to continuously build AI shorts that you can publish and make money on. 
Opus Clip - https://videocreator.tools/opus