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Privacy and Security is not the same thing. Just because there is opt-in feature that supposedly keeps your privacy with cryptography it is not that the same thing as securing information with cryptography from untrusted parties. I usually detest analogies around these things. But the lock for your bathroom door is for privacy and the lock on your front door is for security, the requirements for the lock designs are different. Kerchoffs's Principle still applies for any kind of key escrow in that your information security will be as secure as the security guarantee of the escrow provider.
Also directly from Apple Machine Learning Research page about the homomorphic encryption. Identifying the database shard relevant to the query could reveal sensitive information about the query itself, so we use differential privacy (DP) with OHTTP relay — operated by a third party — as an anonymization network which hides the device's source IP address before the request ever reaches the Apple server infrastructure. With DP, the client issues fake queries alongside its real ones, so the server cannot tell which are genuine. The queries are also routed through the anonymization network to ensure the server can’t link multiple requests to the same client. For running PNNS for Enhanced Visual Search, our system ensures strong privacy parameters for each user's photo library i.e. (ε, δ)-DP, with ε = 0.8 , δ = 10-6. . i.e. it requires a trusted third party not to leak information to apple about your IP as a sidechannel.
Further I would like to have independent cryptographic review of the homomorphic-encryption both of algorithm and implementation before even trusting it with my privacy. There are so many ways of creatively undermining cryptography algorithms and implementations for information leakage.
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