In addition to the free offers, there are “paid” offers, too. i.e. Buy a bouquet of flowers through an online florist, get $7.00 back in your InboxDollars account. Lots of similar cash back offers for subscription box services and eCommerce sites. If it’s something you were already interested in, it’s not bad. Otherwise, no point in spending (read: losing) money in order to make money.
Not a “scam” in the sense of the word, but really not a way to earn any type of money. If you can find the companies that do the surveys and do them on your own with out sites like this you will make a substantially bigger amount of money. The “scam” is they take 90% (if not more, to be honest probably 99%) of the survey payout for themselves. Its the same for the “offers”, they will take the majority of the offer from the company, and give you a small percentage, And if that was not enough, they also take a percentage of your payout. This should be illegal as it is criminal to do this to people.