@Unstable maybe ola/uber is a service that requires a mobility demand, whereas any D2c product is a want product which is instantly desired while seeing the Product eg:- Mamaearth, Mccaffine etc
Also these coupons are priced on per scratch model, not on the acquisition model, a lot of people just scratch the coupon and don't use it, Ola/ Uber have matured as a brand and mostly focusing on the retention metrics, They have a userbase ready they want to make most of them
Ola/Uber grew in the same times as the Paytms and Phone pays of the Fintech emerged, so the growth cycle of both the apps is almost parallel, I'm sure they might have used, coupondunia, cashkaro etc at that point