It's called phishing, search it up on google.

As Zynx said, they're employing a "black hat" (bad/evil) hacking/social engineering attack known as "phishing" (pronounced "fishing"). Much like real fishing, these "phishers" wait for someone to come to their fake website and capture the visitor's information. In the United States its illegal, and I depending on the level of phishing you commit, the Identity Theft Penalty Enhancement Act may be applicable, requiring a minimum federal sentence of 2 years.

You may want to consider reading You must login or register to view this content. for more information. You should also practice avoiding phishing scams (see: You must login or register to view this content.) and reporting them (see: You must login or register to view this content.).

If you want to further understand how these scams work, you may want to read You must login or register to view this content..

If phishing is something that you want to participate in, I'd advise you against it, its malicious, it hurts people, and its illegal.

I will also say, copying a website is easy. In most modern browsers, there's a "View Source" option, which allows you to take the source code of a website, which you can easily modify to send the usernames/passwords to yourself.