I'm skeptical videos are being deleted from the device by Huawei, which the title suggests, until actually proven. More likely is a cloud file storage provider is automatically deleting videos from a server based on some hash/identifier. Similar to how Google/Dropbox can flag copyrighted media.
Apple's "child sexual abuse image" monitoring proposal would do the same thing. Easy enough to implement at the device level--the authorities provide a list of forbidden hashes, any matching file goes away.
Apple's CSAM detection is based on known image's hash. Removing their own shoot images is very different task. How to detect? Maybe just based on geolocation?
