Bruce Schneier reports that Signal will do exactly that (sometimes): https://www.schneier.com/blog/archives/2021/04/security-vulnerabilities-in-cellebrite.html

Bruce Schneier reports that Signal will do exactly that (sometimes): https://www.schneier.com/blog/archives/2021/04/security-vulnerabilities-in-cellebrite.html https://www.schneier.com/blog/archives/2021/04/security-vuln...