Google / Skype are both assumed to be MitM'd; Microsoft in fact purposely re-did things to centralize Skype. If I recall correctly, Google Voice was pretty clearly used for training data.
Why are you using gut feeling to make decisions when you clearly have an internet connection right now and can confirm or deny your hypothesis instantly?
I'm not using gut feeling to make decisions; I am sharing information with an appropriate "grain of salt" disclaimer attached.
>> I don't have time right now to look into this in detail
Repeated in case you missed it.
But since you took the time to call me out (thanks?), I will Google it for you:
https://www.apple.com/legal/privacy/law-enforcement-guidelin... (September 29, 2015)
FaceTime communications are end-to-end encrypted and Apple has no way to decrypt FaceTime data when it is in transit between devices. Apple cannot intercept FaceTime communications. Apple has FaceTime call invitation logs when a FaceTime call invitation is initiated. These logs do not indicate that any communication between users actually took place. Apple has no information as to whether the FaceTime call was successfully established or duration of a FaceTime call. FaceTime call invitation logs are retained up to 30 days. FaceTime call invitation logs can be obtained with an order under 18 U.S.C. §2703(d) or court order meeting the equivalent legal standard or search warrant.
I don't trust anyone (even Apple) to have an always-on listening device in my house. Too many shades of 1984. If need be, I'll push a button on my phone/bt headset and query.