Twitter requires a phone number to use it. You can make an account without one, but this account is very soon going to get locked until you submit and verify a

Twitter requires a phone number to use it. You can make an account without one, but this account is very soon going to get locked until you submit and verify a phone number, even if you just follow a lot of people. On some level I understand this, even following people sends a notification, and some people do use this for spam. And yet I wonder whether instead twitter could just not show these notifications, until, based on the users activity, it's certain that it's a real human, and not a bot.