PvZ reddit users abusing Chomper glitch - Should they be reported?

Yeah, they should be reported. It's important to note that the people who discover bugs or make mods aren't the ones who should be at fault here; giving people download links or methods to pulling off these things are on the players who use it in multiplayer. As such, users whom abused it online should be reported; those who mess around with it in PvE or Private Play are alright.