Cellebrite made a splash some time ago that their tools can extract Signal messages from the (unlocked?) devices. The claim was " Cellebrite can now break into Signal, an encrypted app considered safe from external snooping, it claimed." [1] And I guess that did not sit too well with Moxie :)

[1] - https://securityboulevard.com/2020/12/signal-app-crypto-crac...