Marketing. I have someone's phone number now I can get further info to build a dossier on them for targeted marketing efforts.

OP - Bitcoin payment link is down..

Sales. Prospect calls, phonenumber gets recognized, agent gets all information about the person calling on screen.

My sense from reading the page is that it's not designed for you to put data in, rather it's designed to allow someone get data out with just a phone number. Primary use case is probably for gathering additional market segmentation data automatically.