Hey @bryner! =)
Yeah, it looks like scam, thats true. But the app is not going to steal anything and is a site based on Steem JS, you can look at the code before typing in any data. Because it is hard to trust some guy on the internet, it is possible to use SteemConnect too, which is added to this graphic soon too.^^

The server is online since 8 years and the owner is known buy users of the server, it is a very bad idea to steal keys as known person.

Here the steps for SteemConnect (the Server needs posting rights to place the Comment of the Winner and give the player other options):

Go to https://namemc.com and look for your Minecraft Username, you need the UUID with the "-".
Change the "changeuuid" to your UUID and copy it into the browser: https://steemconnect.com/authorize/@skyroad/?redirect_uri=https://steemconnect.com/sign/profile-update?minecraftuuid=changeuuid
Type /steem confirm steem name on the server, you're done.
(Optional): You're joining a automatic trail voter, if you don't want that, type /steem toggle on the server and you only get rewards. The server informs you always when a STEEM account is synced and tells you how to disable it. If you're disable it, you do not get extra coins, if you let it enabled, you get about 120 Coins on the server every day, which can be used to buy things on the server or payout as STEEM Power or STEEM Dollars at the Banking NPC. There are free 1000 Coins for every new user, that is 0.039 STEEM Power for free. =)