Isn't it purely about ID? Uber/Ebay/WhatsApp don't want you behaving badly, getting kicked or low ratings and then just binning that login and starting over. P

Isn't it purely about ID? Uber/Ebay/WhatsApp don't want you behaving badly, getting kicked or low ratings and then just binning that login and starting over. Phone numbers (and banning prepaid or temp numbers) are the best way to make that hard and to link one actual human to one account. I'd like to see some alternatives, but so far this is the easiest way to make sign up rapid/easy while still making sock-puppetry hard.