This is the easiest way to set up a bridge, but these bridges are primarily designed to allow Iranian dissidents to access the Tor network. The NSA can watch everything that happens on Amazon's networks, but the NSA doesn't care about Iranian dissidents. They want those dissidents to access the internet and leak intel about the Iranian government. Our threat model is different. We need to diversify away from the NSA - GCHQ - Euro Intel Coop. Right now, those cooperating intelligence agencies can watch a majority of the Tor network. If they become a global passive adversary, we lose. We have to move the Tor network outside of their surveillance zone.