The e-reader app is not that addictive. Maybe you meant giving a kid unfettered access? That's a completely different issue and has parallels in many forms of entertainment. But you shouldn't call giving a kid a smartphone/tablet as disturbing on its face.
It is balancing act.
And one more point. Maybe I'm wrong, but AFAIR child inclination to read is created from early childhood, so parents should show their reading enthusiasm to 1-2 years old child and older. Showing enthusiasm is not like "let me read to you", its like "of course I would play with you, but let me finish my book first". Reading to a child is also good, but it is not enough, because it shows behaviour "to read to a child", not "to read an interesting book for pleasure of reading" and not "to prefer book over video game".
I think if you just gave them the tablet and walked away, they might not look for anything else ... but that's true of any human of any age, it seems.
Of course itβs each parents prerogative, but I would never trade the beaten up pile of Gerald and Piggy for an app in a million years.