The legal monopoly isn’t being stolen, it is maintained. Jaywalking does not create a new right of way or transfer one either. What’s being done is taking property that belongs to someone else.
I’m no fan of the way intellectual property is defined, or the public enforcement of property rights for owners who rely on the honor system. But that doesn’t change the situation any more than stealing a DVD from a store and shouting “DVDs belong to the people”.
If you think online piracy is wrong, how is different than what’s wrong with theft?