From what I've read, the scanning only takes place on icloud images. You can choose not to backup to icloud and the images won't be scanned. Other cloud storage

From what I've read, the scanning only takes place on icloud images. You can choose not to backup to icloud and the images won't be scanned. Other cloud storage providers have done something similar in the past where if the hash of the content matches copyrighted movies or music, the content is deleted.