Death Note AU where hbomberguy makes a five hour long video about youtuber Light Yagami that’s initially completely unrelated to the murders (Light would probably plagiarize or have really unhinged right-wing political takes if he was on youtube)

but halfway through he reveals that while researching he stumbled upon evidence that Light might be behind the Kira murders, and then spends like fourty minutes explaining the concept of a shinigami, an hour explaining how he thinks Light used one to commit murders, and then another hour explaining Light’s ideology and why the concept of criminals being inherently evil is flawed

He finishes the video by addressing Light directly and telling him that he (Hbomberguy) had his name legally changed before uploading the video, to something that only he knows, making it impossible for Light to kill him