Re:WhatsApp goes down for users globally
by plibither8 on Tuesday October 25, 2022 @10:23AM
(#33330834)
https://en.wikipedia.org/wiki/Room_641A
Might not be the best "source", but there's clear evidence of it being done in the past.
iMessages are encrypted via TLS in transit. Room 641A-style cable taps do not allow them to be read.
The backdoor in their end to end encryption preserved intentionally by Apple to enable surveillance is what allows them to be read - by Apple.
Would be great if you provide a source for that.