Bitcoiner7.com is a functioning web site, and has been around since August 2013. Although their exchange was never launched. So fully legitimate and has no association with bitcoin7.com other than a similar name.
Bitcoin7 was a business operating in 2011 that was once the third-largest BTC/USD exchange behind Tradehill and Mt Gox. On October 5, 2011, the company reported a theft of 5,000 BTC allegedly stemming from a group of Russian hackers. However, many believe the breach was an inside job and employees ran off with the funds. The Bitcoin7 domain was later sold for $10,000 USD in 2013, but has been offline ever since this incident.
Source bitcoin.com
There is no connection between the two.
Bitcoiner7 has been around since August 2013? Really?
The fact that they don't launch their exchange doesn't mean their legitimate. The site has a cloud mining service but no reviews about it are found as it's a newly created site.
@OP, Always check the url you're using particularly if you're gonna enter sensitive information. I'm guessing that you clicked an advertised site in google (advertised not endorsed) because usually scam sites are there. You can know if it was advertised if there is a small box with a word "Ad" in it..