The Vault 7 page on Wikipedia lists a strange ordering for E2EE messengers. Telegram has the weakest security and has only opt-in E2EE for chats, yet is listed first. WhatsApp's Facebook ownership is obviously problematic, but irrelevant to the specific context. I'd reorder it as “Signal, WhatsApp, and Telegram”.

> While the encryption of messengers that offer end-to-end encryption, such as Telegram, WhatsApp and Signal, wasn't reported to be cracked, ...

https://en.wikipedia.org/wiki/Vault_7#Messaging_services