I don't understand that for various reasons.
1) Privacy is already lost here. If I shout my mobile number on a train with you that's full of people, everyone knows my phone number. If you choose to keep it / use it to call me tomorrow doesn't matter.
2) If Cloudflare can make _better_ decisions based on the information shared by Google, why shouldn't they? As long as it is optional and they don't take their ball and go home^W^W^W^W^W^Wreply with 127.0.0.3 in cases where you don't provide it..