Frictionless phone calls worked for decades until automation made telemarketing possible, at which point we had laws that stemmed the tide for a bit, and then f

Frictionless phone calls worked for decades until automation made telemarketing possible, at which point we had laws that stemmed the tide for a bit, and then further automation made anonymous telemarketing / scamming possible, and we're on the edge of a cultural shift to not picking up the phone when you don't recognize the caller. The latest version of iOS already has a checkbox to block all calls from people not in your address book (24/7, this is a separate feature from "Do not disturb"). Frictionless email had this problem since the very early days. A huge amount of algorithmic effort goes into identifying spam, and there are still large numbers of false negatives and false positives. These were architectural mistakes, and it's not a credit to a new messaging platform that it doesn't see this as a problem worth solving from day 1.