What's wrong with the marketing agencies in Mumbai

In the last 2 weeks I have given 2-3 interviews in different marketing agencies of Andheri and their selection criteria is just plain weird. They take 1st interview as an introduction round and they select some ppl idk based on what, coz they just ask the intro and that's it. After it they call the selected ones for the in-office interview where they ask you to answer behavioural questions on a google form and then take you to the client locations to see how they actually market their products to a new business telling you that they are gonna train you for all this eventually, and then the last interview with the co-founder. It's all fine but how are they actually rejecting someone based on these things? I am not able to understand their selection criteria and all that hassle with every candidate every single day.