Card_Crafter
TF Ace
Most apps involve in such activities to improve their Play Store/App store rating. It's Business for them.Sorry if anyone thinks my response is rude but isn't this just buying ratings/reviews for 100 or less rupees?
I also wonder how this would benefit hubble in the long run too? Users would use a different app offering better discount and some of the legit users would find these paid (indirectly) reviews shady.
Two years back, I bought a Smartwatch from Flipkart, then the smartwatch company sent a whatsapp request to give positive review of their product in Flipkart in return for something else.
Another instance I recall, EMD was offering some sort of a voucher for a positive review on Play Store.
Some companies even buy fake reviews in bulk from companies which sell fake reviews.