Phone number is a universal ID whose transmission and content is managed by another company. It's one which we generally make public, too (that's the point). Plus, unlike email, it's difficult and/or non-free to create more, or manage several of them.
A malicious Google with my phone number could easily sell my web searches to the phone company, for example. Or publicly expose my web searches, associated with my phone number (which my friends or employers would recognize).
It's basically one less layer of indirection, which means much less plausible deniability. It's not a hard line but there's definitely a gradient they're moving down.
A malicious Google with my phone number could easily sell my web searches to the phone company, for example. Or publicly expose my web searches, associated with my phone number (which my friends or employers would recognize).
It's basically one less layer of indirection, which means much less plausible deniability. It's not a hard line but there's definitely a gradient they're moving down.