Amber Petersen was lounging in bed with her 7-year-old daughter last week, watching her play the popular children's video game Roblox on her iPad when she saw a disturbing display on the screen.

Roblox, an online gaming platform with more than 111 million daily players, has recently been spotlighted in a disturbing case involving the grooming and abduction of a 13-year-old girl from West ...