So all you would need is an app that very slightly modifies one bit in every image you send at random, and it'll never be caught by the synchronous system? Does the async update retroactively delete older posted images? And if so, how long would it take for that to happen?
Probably, an app that applies some random distortion to your source image, just like your own recaptcha.
Also Adverisal Patch is a thing, so that could be applied to specifically distorted the system in a human invisible way to misguide the machine learning models.
Whether it will be retroactively deleted, it think there is a possibility. If WeChat periodically scan your image and find your image violating the censorship, it will probably delete it and report to the authority.
Again, some encryption needs to apply in this case. Just like in the old days.
Technical measures like these don't have to be watertight to be effective with the 'right' laws in place, this has been demonstrated by the restrictions on bypassing 'content protection measures' in the DMCA.
Those found out to be using means to bypass image censoring will eventually see their 'social credit score' plummet and be kicked off WeChat and/or the 'net.
They say the async is operating on a timescale of seconds (presumably long enough for the batch OCR jobs to get around to it), so you can bypass it, but that won't do you much good.
