User Contributions to Stack Exchange are licensed under [cc-wiki][1] with [attribution required][2] so there's nothing wrong in copying, assuming the attribution is given

To be clear, attribution required means:

>  - Visually indicate that the content is from Stack Overflow, Meta Stack Overflow, Server Fault, or Super User in some way. It doesn’t
> have to be obnoxious; a discreet text blurb is fine.
>  - Hyperlink directly to the original question on the source site (e.g., https://stackoverflow.com/questions/12345)
>  - Show the author names for every question and answer
>  - Hyperlink each author name directly back to their user profile page on the source site (e.g.,
> https://stackoverflow.com/users/12345/username)

In this case, the site fails to do any of the above & is running violation of the licensing.

In this case, [this meta question mentions how to report such scrapers][3]:

> Send all reports of SCRAPERs to `[email protected]`. Please
> include:
> 
>  - the URL of the copied post
>  - the URL of the original post on SE
>  - for high-rankers, the search string you used (and the name of the search engine, if not Google)
>  - any other details you noticed and want to share, because you're awesome


  [1]: http://creativecommons.org/licenses/by-sa/3.0/
  [2]: http://blog.stackoverflow.com/2009/06/attribution-required/
  [3]: https://meta.stackexchange.com/a/200178/133693