FWIW I'm not defending this, but it's important to get the facts correct.
1) Someone can't just randomly review one of your images. The implementation is built on threshold secret sharing, so the visual derivative can't be reviewed (is cryptographically secure) unless you hit the threshold of matched content.
2) You're uploading these files to iCloud, which is currently not end-to-end encrypted. So these photos can be reviewed in the current iCloud regime.
1) Someone can't just randomly review one of your images. The implementation is built on threshold secret sharing, so the visual derivative can't be reviewed (is cryptographically secure) unless you hit the threshold of matched content.
2) You're uploading these files to iCloud, which is currently not end-to-end encrypted. So these photos can be reviewed in the current iCloud regime.