Ok, let's take a look at the website.
ClaimBitcoin is the Bitcoin generator that everyone has been waiting for. Currently it is the only working Bitcoin generator out there, and at the moment it can generate anywhere from 0.001 to 0.5 Bitcoins per day.!
So, the website is a "Bitcoin generator" that can generate from 0.001 ($5) to 0.5 ($2250) per day for free... Now, if you are a smart person, would know that this already seems like bullshit from the start.
If you want those free coins, you will need to submit the form at the top of the page, and they will ask you to do a survey to complete your "mining". Which may cost you money.
TL;RD: It's a fake website that asks you to do surveys for them, so they can earn money fooling newbies that think you can generate money from nowhere.
I have seen websites like this before. I remember people spamming "invite 5 friends and win a $50 steam card" websites that need you to do surveys in my social medias in the past.