Comment by maqp

>It also used to require sharing phone numbers to add contacts

It no longer doesn't. It took them a while because you can't just slap features like that. It's not a string in a database like with Telegram.

Telegram has great UX because you can build things fast and easy when you don't have to give two shits about the security side of things. You can cover that part with grass-roots marketing department and volunteering shills.