Does anyone else use Habit Gift?

I've been noticing some bullshit lately. I have plenty of coins and tickets to cash out a 5 dollar Amazon gift card but for weeks it's been saying they are sold out of them. Has this been happening to anyone else?

Also, are there other apps that are similar to this one? Not necessarily walking apps but points for sping daily activities of living plus playing games to cash out on gift cards.

Thanks guys!