In the early 2010's it was my understanding, through employee conversations, that both Cellebrite and XRY were assisted by handset manufacturers. This may have been merely port drivers, proprietary specs, or a plethora of other possibilities.
During this same time AT&T stores used Cellebrite devices for transferring data between a customer's old and new devices (typically in a back office).
Relevant today? Likely not, but still interesting.