I just plan if I buy btc from A then transfer to B. I still have some amount of profit so I transfer fiat to account and then loop like this.
(can not take it out to do profit as coin from B coz every coin from B are all higher price from market so it suppose to be only way out)
That why they know about my fiat coming on my account. this cause me to study about tax from cryptocurrency if it's as my plan I think I still have profit left some after I paid tax to them.
But I'm not sure this action counts as money laundry? and profit from bitcoin do they calculate as capital gain or income?