Karen is experienced in investing, but she hopes to boost her retirement savings by joining an investors group on WhatsApp. After a few months of receiving positive trading tips, she follows the advice to invest in several stocks in Asian markets. Her portfolio plummets, losing tens of thousands of dollars. Karen is the victim of a classic "pump and dump" scam: scammers buy a very cheap stock, persuade investors to buy by spreading deceptive claims, and then sell their shares once the price rises, leaving investors with a loss. Learn how AI and an army of bots are making this age-old scam easier for criminals.