Don't waste your time giving interviews at such a company. Interviews are quite simple, with pretty much the same questions asked by everyone for many years.

After every round, HR told me the feedback was positive. They conducted all rounds, including two behavioral ones.

After two days, they informed me that they couldn't proceed with the profile without giving any specific reason, stating it was a collective decision.

I was informed that all rounds are knockout rounds. Then, what was the need for conducting behavioral rounds? Please respect others' time as well.

Pretty much everything is already on the internet.