About the phone, its not a must, just for communication by SMS, not have to validate it.
Didn't know that it was optional. Good to know that.
I think its preventing 50% new users to join on PlayYourBet. Although possible register with dummy phone number but how will know new users who are not on the forum. Perhaps they would think its mandatory to use real number. Because its showing mandatory with red start and asking for valid phone number. I have suggested them to remove phone number options from registration page. It would be appropriate on insider dashboard since its optional. Especially crypto users wouldn't encourage to provide real phone numbers.