This is quite worrying. Google doesn't have the mindpower to deal effectively with scraping so now it is, in effect, socialising the problem by getting the public and users to submit the details of scrapers. This is what led to the decline of many web directories when they had to rely on user submissions. It is a positive development in that it will solve a percentage of the problem however until Google manages to automate the process of detection, analysis and removal, it is still going to have a massive problem. At best, this is a start. At worst, it is the beginning of the end of Google as a search engine with a relatively clean index.