I've never regarded a phone number as something extraordinarily personal. The amount of spammers that happen across my phone number is ridiculous. It's nice when you interact with a real human using your phone number (unless it's a recruiter ffs), so the more I give it to the more likely that is to happen. I guess I just don't understand what's personally revealing about a phone number. I give my phone number to mundane things all the time so people can communicate with me. The "need to know" bar for my phone number is pretty low. It plays about the same role as an email address in my life.