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This doesn't follow. The bounce message used to (effectively) say, > abc@icloud.com forwards to real@gmail.com If they switched the new domain and did nothing

This doesn't follow. The bounce message used to (effectively) say, > abc@icloud.com forwards to real@gmail.com If they switched the new domain and did nothing else, it would say: > abc@privaterelay.appleid.com forwards to real@gmail.com That's no better. Fixing that privacy leak is unrelated to whatever the destination domain is.

floam 2mo ago
No, using a different domain makes it easy to across the board add a rule: don’t treat as Apple ID.
- dannyw 2mo ago
  I'm not sure if I'm following. Apple is capable of creating a lookup table, or an atomic database read query.