3 rounds. Leetcode medium questions for coding round, system design - medium questions like design a chat app, resume based questions. Got rejected after system design as they wanted optimized solution

Absolute waste of time to interview with them. For the first round which was a Javascript they sent a very junior person who was polite but didn't seem very sure of some of the answers himself. After this they wanted to call me to office for the DSA rounds but I said I wasn't available the same week so they scheduled a system design round directly with a manager level person. This went well as per me but after this there was no communication for more than 2 weeks. Suddenly the recruiters came back saying they want to proceed forward with more rounds with me and scheduled a "Software design" round with me. When I told them I already had a design round they said this one was different. When asked what would be different this time they didn't reply anything and just rejected my application after a few days. what a waste!