Block introduced Dessa, an AI model trained only on human speech. It can hold real-time conversations by listening. Block calls it the first AI of its kind. Jack Dorsey said it feels like talking to a person. Social media users praised its natural-sounding voice. Some raised concerns about its potential for scams and fraud. CoinDesk reported both praise and concern. Justine Bateman warned it could trick people into lowering their guard. Shiv Aroor said scam calls could reach pandemic levels.