> what stops this system from being abused for non child pornography purposes
You are changing the subject. That challenge has nothing at all to do with the OP’s false claims. They are still false.
Someone who can poison the database can indeed match non-child abuse images. The safeguard against that is that both Apple and NCMEC would need to conspire. This mechanism does not prevent such a conspiracy.
> Arguing that Apple's algorithms are fine misses the point.
Who is arguing that they are ‘fine’? I’m simply pointing out that they are not vulnerable in the way the poster claims them to be.
The images they have posted will not trigger the system.
If you want to debate the ethics of other aspects of what Apple is doing, there are plenty of threads elsewhere. This thread is about a false claim about a vulnerability in the system.
False claims about the vulnerabilities don’t help us to reason about what the risks actually are and detract from the moral or ethical debate.