In part 2 of his Cloud Blog Trilogy, Andrew explains why it's better for everyone if cloud providers are willing to be open about how they run their services.
With DDoS, we typically observe a moderate degree of attacker persistence. DDoS attacks are relatively easy to launch from a number of online booter services, and the availability of cryptocurrencies for payment has made it easy to remain anonymous. Attackers can try their hand at DDoS for little effort and money, and in relative safety. They give it a go, try a few things (vector, endpoint, and scale changes), and for those with effective defenses, the attacker eventually burns out.