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Hasbro is a toy company that owns and operates Wizards of the Coast (which in turn publishes Dungeons and Dragons products). A couple years ago, they tried to destroy tabletop roleplaying as we know it by manipulating longstanding legal agreements. They hoped to build a monopoly on the corpses of other game companies that were already barely managing to stay afloat against their existing monopolism.
Rovagug is a mythical god-being that threatened to devour all the gods and the universe of the Pathfinder setting.
Your GM is probably likening them to one another as evil consumptive entities for which there is no redemption.
I can't tell if OP really doesn't understand, or if they just wanted to drop this joke.
Anyways, as Ravingdork mentioned Hasbro tried some legal manipulation (which they ultimately did an about face on because of the backlash on social media).
Rovagug in the Pathfinder/Golarion setting is an evil deity seeking to consume and destroy pretty much everything.
Draw analogies as you like.