The golden rule of evaluating something that might be a scam, is simply: "Why would someone pay me to do [x], how much should they pay, and am I exposing myself to potential fraud?".
So for something like this, you can easily see that someone would make money off of you looking at ads. In theory, they could offer 'kickbacks' to you, the ad viewer, as incentive.
The question is whether the money earned off of your attention span would be able to fund some meaningful payment to you. start from first principles: how much money does an app maker earn from you viewing a single ad? Maybe 1 cent? In that case, If you would need to watch 1,000 ads to earn a $10 rebate, then the profit to the app maker would be $0.
Keep in mind this assumes you are not influenced by the ad [counter to the reason someone is paying for you to see it].
I think in most cases, to the extent the listed rebate-type program actually exists, then yes you could assume that some money is available, but probably the hourly rate for such activity would be closer to $1 an hour or less, rather than $10 an hour. Remember that downloading such an app could expose your information to 3rd parties, and if you are required to insert personal information, there exists a risk that it would be distributed for future scamming.
It's probably also difficult to determine the true earnings rate, as the app maker likely has control over various levers that might make payment seem imminent when it would still require you to jump through more hoops.