I don't know about fast money but there are apps that let you redeem for gift cards. Like receipt apps - but again not fast.
John Sauce
Try using freecash.
Susan Piluk
Nothing is quick, but I've earned some free gift cards from my receipt apps.
lady grey
The most legit I can think of is Prolific where you do surveys and studies (stay with me!) But they're usually from universities or product developers, not randos who bait and switch on every other app. If you can write decent English that's all the qualification you need 99% of the time. Only catch is last time I checked they have a waiting list, but it is a solid way to make some extra cash. I suggest at least get on the wait list if it's still in effect, for whenever you get accepted
Marie Anne
Don't play the same game all day. Choose new ones that pay out the most at the beginning.
And make sure to join the challenges. Those pay off well.