Jealousy that IH is more popular than he is
plagiarism is still bad tho, pity about that
Josh is jealous of most everyone. IIRC, doesn't he hate Metokur too? Probably because Metokur is/was everything he isn't - charismatic, funny, not a tryhard faggot, doesn't sperg out at everyone.
It's hard for me to imagine someone who cares about youtube plagiarism. Like what level would your life need to be at for this to be a concern?
You're in luck, for Josh has no life. That would require dealing with "normies" and Josh's "not like the other people" routine would kick in.