Is it the founders or VCs who have money without mind ?

Confidence in Bullshitting (aka charisma) is more often the determinant in funding success than actual skill or experience. Combine that with a good market cycle and it's pretty easy to get stories like these. Happens every cycle.

With dukaan it was more hope and hype. Remember it was khatabook and ok credit who has launched shopify like digital stores along with bookkeeping. Dukaan’s founder built the app for khatabook. At the time yc had funded on theme of shopify for india so investors hoped there is a market and somebody figure it out. Pagarbook got the money around the same time. Reportedly, sequoia tried to hijack the deal. Lightspeed convinced the dukaan folks to take their money. In a typical Indian fashion, these guys just hoped there would be a big enough market and invested based on hype. The enthu died down after six months. Almost all of the above mentioned startups are no longer on a rocket ship trajectory (not dissing on them, but they are not in that high growth zone that was expected)

What’s the deal with Udaan? I thought they were doing well off

Wait and watch Unacademy. These guys are ruthless and they are going to do crazy shit. Don't count them out just yet.

Dukaan is a great idea but twitter behaviour is something VCs any judge. Honestly it was mostly driven by FoMo for VCs as well. VCs are bunch of MBA grads looking to spend their portfolio money in the hopes of recovering 10X+ at some point in time.