Since I was the one who complained about problems with INR deposits through UPI on stake.com, I believe that it is my responsibility to share my recent experience.
It is good to see that stake.com took my feedback seriously and improved its INR deposit process. Now, whenever there is a payment delay on behalf of stake.com you do not have to wait for days in order to get a refund. 99% of the time it goes through instantly and the delay is also limited to 2-3 minutes. I have deposited many times recently and am quite impressed by the improved deposit process.
Cash outs are instant as always.