I'm surprised nobody has mentioned how notorious Discord is against privacy.
- Use a 3rd party client: locked out until you give a mobile number
- Use a VPN: captcha upon captcha and ... probably locked out and need to give a mobile number
- No Google Voice numbers
It is never about account security with these companies. You can use any mobile number on the internet and that somehow = 'security'
I do think it will follow FB in the sense that future kids won't use it.