No, I don't fall under alumni offer. I have my salary account with HDFC for 12 years and going. Had Regalia LTF for 3 years and they first offered a paid upgrade to DCB, to which I declined. Six months later, they had some quota to fill, so they offered it LTF and I took it. I've had it since the days of 10X RP on Amazon. It's been devalued a lot but still a good card to have as it gets 3.3% almost everywhere. The 5% cards are always with some limitations and so if I am not sure it will get that 5%, I default to DCB.
I don't have rent to pay, so my expenses are limited to online shopping and groceries. DCB points have been paying 70% of my flight fares for more than 5-6 years. Most rewarding card I've owned.