> Apple intends to install software on American iPhones to scan for child abuse imagery

> Apple’s neuralMatch algorithm will continuously scan photos that are stored on a US user’s iPhone and have also been uploaded to its iCloud back-up system

Why is there any need for Apple to install software on the iPhone if they are isolating the algorithm to run only on cloud storage, not local images? Not a programmer, so maybe a simple explanation.

Also, if this is isolated to iCloud, won't criminals just start using a different cloud backup provider?