@Maggie144
Hello!
Since Network Lock is enforced via pf rules, which act directly on the kernel filtering table, it is not plausible that Apple services can bypass them. Leaks observed on Catalina and Big Sur with other software (not our software) take place because filtering rules are enforced via specific network API. The specific network filtering exceptions (for Apple programs) hard coded in macOS Catalina and Big Sur filtering API, which caused a lot of controversies (and rightly so), allow the horrendous behavior.
Actually, lack of traffic leaks when Eddie or Hummingbird Network Lock is active on Intel Mac has been thoroughly verified by us through external network sniffers. We confirm that nothing, including Apple services and apps, is able to bypass the firewall (pf) rules. We can perform the same verification on Mac M1 in the near future.
The problem in iOS is worse and can't be resolved, because in iOS devices you are not in control of the device filtering table (and you are not in control of the device in general). Anyway we do not write software for iOS, as you know. Should, in the future, "Apple Silicon" platforms evolve in iOS-like system which the user can not control, then they will be unsuitable for purposes where privacy and a layer of anonymity are a priority. We doubt anyway that Apple will expel its own customers from administrative device control like it did with iOS, but let's wait and see.
Kind regards