Previously, senders of large volumes of paid-for (by the sender) yet unwanted (by the receiver) emails had to corral their own clouds of distributed, low-cost computing resources (a.k.a botnets). Amazon provides similar capabilities for pennies an hour. Both Amazon's and the emailers' business models work, and questionable penetration of third parties' computers is no longer required.
Somebody finally solved the ????? = Profit equation. What's everyone getting so worked up about?