Comcast leaked WiFi credentials on their routers in customer homes, making it easier for other people to piggy back on your WiFi, which is already easy
Based on the plethora of customer complaints on the web, Comcast has much bigger issues to resolve
It does give people who've been cutoff due to using too much bandwidth a new reason to complain about that
Probably makes it easier for someone to control your IoT devices and change your thermostat