In addition to that you can observe that their website's certificate details. it seems they are using fee ssl provided from cloudfare. Not really a confidence booster and definitely not even close to fintech security which we can trust.

Mastercard logo is displayed without any hint that they are official partner of visa or mastercard. The said bank and offerzen site does not have links etc. There is no documentation or hints about legal disputes resolution or any kind of compliance mechanism ever mentioned on site.

Though I like the concept, will hold off still I get to know that the site is genuine.