I believe December Cash 750 located at decembercash750.com, which talks about giving you $750, is a scam website. This type of scam is survey-based that appears to collect your data and sells it to vendors. The website lures potential victims to it by promising them $750 for completing simple deals.
About December Cash 750 Website

I have created an account on Cash App 750 about 30 days ago. I worked hard to complete all tasks on the website and asked them to transfer the money to my PayPal account. I keep checking my PayPal account for more than 3 weeks, but the money they promised has not reached my account. I will keep checking my account but eventually will give up because this keeps stressing me out.