The use of phone verification to login or sign up, is a solution looking for a problem and it solves nothing as it creates more problems.
Due to Twitter's poor security and use of SMS 2FA which has been proven for years to be insecure as I have repeatedly said [0], now the SS7 2FA hacks, SIM-swapping and SMS phishing scams are going to be much scarier.
Henceforth, one can expect a Pegasus-like zero day to be mass deployed on to Twitter users in that breach and remotely exploit their devices easily.
It's 2022, and we're still using SMS 2FA. Twitter should get a massive multi-million fine for this breach.