Of course, that entirely depends on where you keep your money. Some jurisdictions might care less about the source of one‘s funds (let‘s say Cayman islands or something) than others.
But generally speaking, banks and brokerages in many jurisdictions are required by law to report suspicious activity, money laundering, … to the authorities. And nothing worse than being caught in an investigation and the only thing you can tell your bank about the source of your funds is that a friend gave you some cash or something…
Some example of a bank describing what they‘re doing in that regard:
I’m not saying you’re wrong (you’re perfectly right) but I’m receiving so many conflicting advice on this forum that I’m more confused now than in the start. Can someone tell me how much a tax specialist/tax lawyer costs in Taiwan?