* normal ppl care about chat history more than encryption, and telegram can be accessed from many devices without tethering from one (a la whatsapp). If you want E2EE anyway, you can use E2EE chats.

* Whatsapp is closed source, so you can't tell if the encryption is true anyway (what if they are transmitting your private key?). Telegram has open source implementation and API.

* Facebook will not have your metadata. The subject of these events is basically FB having too much of data about you.

In my case, I care more about being able to use it without depending on my phone, than E2E. The single thing I hate the most on any messenger is my phone having to be on and online, for me to send/receive messages on my computer