I found in privacy policy of one particular exchange that it transfers data about me to credit organizations. Actually the same is true for banks.
In what cases do they do this thing? If I make big enough trade volume at exchange, say $50,000 for year, is this information transferred as well? I suppose it happens only if you do margin trading or something... don't know much about it, except that you take loans from brokers...
Yeah I realize $50k is not big for you
The data that they gather from you is mostly to take into account the statistics of the exchange and/or banks in the area of trade volume. There are a lot of statistics involved and some higher up companies may request for such information for a detailed research they may do on it. This results in the analysis you often see on prominent banks/conpanies/exchange. Monitoring is naturally needed as well for order to happen since a business relationship isn't about trust, but rather the ability to abide by the contracts and trust cant bind you to these contracts.