The 'chance' is 100% -- collisions and even arbitrary second preimages have been constructed.
> The hashes are for some of the worst content out there, its not trying to detect anything else.
You don't know that because apple developed powerful new cryptographic techniques to protect themselves and their data providers from accountability.
The chance of a mismatch is 8.63616855509e-78%
If the hash was an atom then you would have to guess which atom in the observable universe it is. That is how likely a collision will happen.
[1] https://academic.oup.com/cybersecurity/article/10/1/tyad020/... see the girl/dog image on page 12 for one of my examples in the academic literature.
The 'chance' is 100% -- collisions and even arbitrary second preimages have been constructed.
> The hashes are for some of the worst content out there, its not trying to detect anything else.
You don't know that because apple developed powerful new cryptographic techniques to protect themselves and their data providers from accountability.