I interpreted your statement as:

I'm kind of unsure if [widespread, unchecked] piracy is on net good or bad for the world (although it is clearly good selfishly)

But it seems you meant:

I'm kind of unsure if [my individual act of] piracy is on net good or bad for the world (although it is clearly good selfishly)

I'm unsure if legally enforced copyright is on net good or bad for the world but I'm inclined to think bad. As a content creator however copyright laws represent an implicit subsidy on my income and since all of my income ultimately derives from the sale of content but only a fraction of it is spent on content I'm inclined to think that [widespread, unchecked] piracy is bad for me selfishly even though [my individual act of] piracy could be good for me selfishly.