Earlier quoted context omitted.
Here is a research how much phone number verification decreases account fraud a.k.a. spam bots http://static.googleusercontent.com/media/research.google.co...
Of course, in order to help out the unfortunate website operators, people should willingly give up pii that the same companies have shown they don’t give a damn about protecting. /s
The most abused and dishonest phrase of the 21st century.