In both cases people are stretching to come up with hypothetical scenarios about how these systems could be abused by a government ("they could force Apple to insert non-CSAM hashes into their database" or "they could force Google to insert a backdoor into your app") while completely ignoring the elephant in the room: if a government wanted to do these things, they already have the power to do so.
If your concern is that a government might force Apple or Google to do X or pull product sales in their country, whether Apple performs on-device CSAM scanning vs scanning it on their servers, or whether Google signs your app vs you signing it doesn't materially change anything about that concern.
The outrage around this particular situation is even more confusing to me because you can opt out entirely by disabling iCloud Photos, and if you were already using iCloud Photos then the scanning was already happening on Apple's servers anyway, so the only actual change is that the scan now occurs before instead of after the upload.
In both cases people are stretching to come up with hypothetical scenarios about how these systems could be abused by a government ("they could force Apple to insert non-CSAM hashes into their database" or "they could force Google to insert a backdoor into your app") while completely ignoring the elephant in the room: if a government wanted to do these things, they already have the power to do so.
If your concern is that a government might force Apple or Google to do X or pull product sales in their country, whether Apple performs on-device CSAM scanning vs scanning it on their servers, or whether Google signs your app vs you signing it doesn't materially change anything about that concern.
The outrage around this particular situation is even more confusing to me because you can opt out entirely by disabling iCloud Photos, and if you were already using iCloud Photos then the scanning was already happening on Apple's servers anyway, so the only actual change is that the scan now occurs before instead of after the upload.