The cost of crawling will be many times lower than Apache Nutch.
It's fully managed: nutch is NOTORIOUS for being hard to set up and maintain. It could take you months before you can launch a mid-scale crawl using nutch...
We've done crawls of over 250TB and 3 billion web pages. If you need to crawl more than this you can simply shoot us an email and we'll provision resources for your mega crawl.
