You are confusing privacy with anonymity. You aren’t anonymous because your user is linked to a phone number, but your communications are private due to how their encryption works.
On the location attack: it is a matter of configuration and your location will be as ambiguous as thousands of miles.
You need a phone number to sign up which requires identification in most countries.
Also anyone who knows your username can ping where you are at any time: https://gist.github.com/hackermondev/45a3cdfa52246f1d1201c1e8cdef6117
You are confusing privacy with anonymity. You aren’t anonymous because your user is linked to a phone number, but your communications are private due to how their encryption works.
On the location attack: it is a matter of configuration and your location will be as ambiguous as thousands of miles.