Low value and frustrating rewards programme

So tired of company's "reward programmes" that just take advantage of false marketing and consumerism. This is the 2nd time I have completed a task for absa rewards programme for a voucher which is of incredibly low value and short expiry date. Before completing the task which cost significant money (in this case spending R500 on electricity) my reward was undisclosed and eonly after I complete the rask am I informed its a R50 voucher for Uber eats. This amount still requires me to spend further money, as nothing on Uber eats is worth R50 or less. And then it is only valid for 2 weeks! So I need to go out of my way and usual spending to get Uber eats, only go realise when I do finally want Uber eats that the voucher has expired. This is the 2nd voucher from absa that has expired. Vitality miles or FNB eBucks rewards do not expire, why should ABSA's???