[quantummkv]

> There is some reports that they sell your contact information to shady investment marketing companies. Many people have observed a sudden influx of calls from small, unheard of investment companies calling them up with investment offers, after they have signed up with Zerodha.

This might be only a single anecdotal data point, but I have been using Zerodha for more than a year and I have not received any spam call from any such investment companies. So whatever the spam call issue maybe, I doubt it is Zerodha selling your data.