Not sure how this exactly works but the design of the website with loads of popups makes it look like a scam.
moo://en.bitcoinbillionarie.com/?session=791d4053f88c40368dbe21b584c14efd&aff_id=3968&fpp=1
Those are bitcoin scams they try to get your credit card information.
Also you might have seen my post of the scam: http://scammer.info/d/30117-bitcoin-scam
We can make more investigation on those scams and remember to report those websites, but good find.
I just found another german one moo://the-bitcoin-circuit.net/de/sign-up?campaign_id=35gwRpF4&external_click_id=137d07a6-72cb-405d-a938-9685de764fb1&affname1=webcat&net3=1111&fbp=&reserv4=&reserv5=VmrZuwVq9m&aff_sub4=&ksget=1&token=5e14aac996ae6d0ca76ce146
and here
https://bitcoinevolutionapp.com/index-de.html?click=75996510&mode=optin&api_url=%2F%2Fthousandtalesapp.com%2Fapi%2Fv1&p=thousandtalesapp.com%2Fapi%2Fv1%2Fpixels%2F75996510%3Fpixels%3D463%252C440&pL=thousandtalesapp.com%2Fapi%2Fv1%2Fpixels%2F75996510%3Fpixels%3D466%252C464%252C441&apg=1&push=0