That's seems like your personal suspicion. How should we rate your in expertise?

"The top justice officials of the United States, Britain, Australia, Canada and New Zealand said in a statement that the growth of end-to-end encrypted apps that make official oversight impossible – like Signal, Telegram, FaceBook Messenger and WhatsApp – “pose significant challenges to public safety.” https://www.euractiv.com/section/cybersecurity/news/five-eye...

https://www.justice.gov/opa/pr/international-statement-end-e...

>definitely backdoored given the agencies who choose to use it

Agencies who know about backdoor use different app and promote the backdoored app to others and use secure app themselves. Sounds more logical, yeah?