Telegram has voice chats now and Discord is just terrible privacy wise.
Telegram isn’t the best obviously but it’s miles better than Discord and it got a lot of features which should make convincing friend to switch easy
Telegram is used widely in Europe I believe. Good luck getting your friends to switch off discord. It is impossible to get people to take even the most insignificant action for privacy in my experience.
I use signal with the few people that have any opsec awareness.
all my friends use either fb messenger or instagram dm or whatsapp and it’s all just facebook. I wish teens found it really cringe and embarrassing to let FB spy on you
Are you aware of Telegram’s many features? You can use that to entice them.