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that's credit not only because of the it team but attributed due to less number of traffic towards mi.com. e-commerce giants like Flipkart or Amazon are handling equivalent traffic of mi flash sale every day. say thanks to Amazon because they are showing the correct message. mi.com only shows, you are on the queue that means your request is not passing through after a certain point.
and the Amazon page showing, doesn't mean Amazon crushed, it is simply a notification which is very much configurable.
don't take this comment negatively because constructive criticism is also required for betterment of services.