Ask HN: Why has Telegram been blocked in Russia, but WhatsApp hasn't?

If I had to guess:

* Telegram's large groups/channels make collaboration easier and more of a threat.

* WhatsApp users who are are all identifiable to the Russian state via their phone numbers; Telegram allows users to interact anonymously.

* Telegram is more widely-used in Russia.

* Telegram is Russian, so could be more susceptible to political pressure from the Russian authorities.

List of countries which block Telegram but not WhatsApp

1.Russia

2.Egypt (signal is blocked too but why not whatsapp claims to use same encryption layer)

3.Iran

To be clear: I'm asking about what HN thinks is the real reason, not the officially stated reason.