Why does gift cards have expiry

My friend lost inr 1300 due to gift card expiry - why does gift card need expiry date ?
From one customer flipkart can take rs 1000 then from lakhs of customer how much amount flipkart have take ? So please kindly remove expiry date

Time for flipkart from the shoe of customer :(

Akhil1234567 about Flipkart - Online Shopping App