I see. I guess you read the recent news about speculating MYR, but it is not relevant to MT4 trading here. That speculating MYR one really HAVE OWNED certain money in physical form or maybe saving in bank account. In other words, they are doing money exchange in a very large amount, so government do not want change money in so large amount money.

MT4 trading is not doing money exchange because ppl does not own any physical asset of money when do trading. In other words, you are just guessing the direction of the index number (index number of exchange rate) when open trade or close trade.

The call from bank is not aimed to trace any money laundering action, but bank want to keep a record as evidence in case one day the authority/auditor wants to see the record.  To avoid any confusion or misunderstanding, you should read another old existing rule 2013.

http://www.bnm.gov.my/microsites/fraudalert/0203_forex.htm