By the dor hamabul they stole pachus mishaveh prutah. It is technically worthless. Nevertheless non Jews are chayyiv on that as well.
If you steal someone’s music cd movie or computer program game… that is real gezel. A cd costs $19 not 2 cents or whatever the real value of a half prutah is today. Its not petty. Illegal downloading steals Billions of dollars out of people’s pockets. (Not to say that Hollywood doesn’t deserve it as well as the musicians who create filthy music) however take note it’s far from petty money.