I think one big difference is that the intrinsic permission in AP is that I want people who follow me* to be able to read and react to what I make. That's the bargain I make when I post on an AP-enabled service; it works like a social network.
We all make concessions for bulk redistribution with tools like relays because they help connect people together. They extend sociality.
If that data is bulk extracted without providing value, that's a problem.