Anyone hear of the Mono challenge?

This doll is popping up on YouTube channels for kids and encouraging them to kill themselves, & act out.... for explain showing them how to turn on the stove when parents are asleep.... my coworker actually thinks her kid saw this pop up due to him actually turning on the stove (twice) hes 3 years old! I asked my 6 year old and he just looked at me all serious & said no, yet I'm not comfortable with his answer, I will be asking him again, so has anyone seen or hear of this? What are your thoughts? How can this be prevented? Very devastating to me