[kbenson]

> Knowing someone's phone number means you can reach them on WhatsApp

...that would be super useful if I had WhatsApp installed. It also means that WhatsApp is tracking the phone number of all the people and doing selective (assuming only your friends can see it) publishing of it. I guess that's usually okay, but it also kinda wierds me out that it leaks info that way.

My phone number is already managed by me, I've given it to the people I want to have it. This really just limits any WhatsApp messaging I would to to entities that I want to have my phone number. It's probably much easier to block WhatsApp accounts (and attempted messages) than calls (phone calls which are synchronous communication have a much higher urgency to me than some random phone ding that's async).