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The opposite is true by a non trivial margin. (It doesn’t change the fact that WeChat is massive scale.)

Then the question comes if wechat and qq uses the same backend as they are owned by the same company.

The Discord number is inflated - 250mm is registered users, not MAUs. When they announced 250mm registered, they had 56mm MAUs.

Telegram's 200mm is MAUs, and that number is over 1 year older than Discord's information.

No, wechat's infra is most in C++[0], e.g phx*[1]

WhatsApp’s servers are largely written in Erlang too, right?

they were ejabberd when they started up ;)

Interesting. Source?