One thing I didn't see discussed at all (mind you, there were thousands of comments on various threads) was crowd sourcing the search for exploited domains in p

One thing I didn't see discussed at all (mind you, there were thousands of comments on various threads) was crowd sourcing the search for exploited domains in people's browser cache (as opposed to search engine and archive caches). If I understand this, it "simply" matches against the already known list of known to have leaked domains. Right? But what about potential other leaks that didn't get cached by search engines but that might live in people's caches??