How is it much different from a search index? it’s just a new interface to get at some info, rather than Google and Firefox, it already pre-browsed the web for you, and is displaying back the content. If the end user gleans some actual copyrighted work from the search they still need permission to use it, but it’s also likely it’s just a derivative, or the end user is just reading an example and learning from it at consumption time. Is a web crawler violating copyright? Or is it the user who sells a copyrighted image?