Bad practice imo bro.. unless it is requested from customer end they should not increase it. And even if it is initiated from customer end, Flipkart should check their credit score, purchase history and repayment history. I don't think Flipkart considers any of these. I personally know many people with poor credit history got their limit increased to 50k or 70k. I see a wicked business behind this. they keep increasing the limit to a higher value and at the same time offer no cost emi on products using this pay later limit.
I could only remember a famous dialogue from a Tamil (heist) movie - to cheat someone, just induce his desire or craving or greed.
They provide the opportunity to buy higher priced products which we wouldn't have bought without this higher credit. Many people would succumb to this strategy and get strangled with the repayment. Those who have control over their spendings will not be affected. But those innocent people who buy lot of products thinking this pay later service as a boon should be cautious. We should not forget the fact that this pay later credit comes with a interest rate of 24% almost 10% more than most of the credit cards in the market.