So I came across this website https://greatbridgegroup.com/
You basically get extra cashback on top of the cashback/points you get with your reward credit cards for sharing your purchase history to them. They make the money by selling our shopping data. Seems like a legit site so I went ahead and connected my cards and got close to $20 bucks balance already. They pay you in the form of PayPal or Amazon gift card every 90 days starting the date when you first join (if you qualify.) To qualify, they must have an available opening in your area. Maximum amount you can get is $60 cashback every 90 days, $240 yearly maximum.