I don’t know why you’re being snarky about it man. The ambiguity is with your original post referring to “trading” - as far as I’m concerned this implies forex trading rather than exchanging holiday money. I’ve never heard “trading” used in the latter context. If you want people to understand you, try phrasing your question accurately.
You’re also the one who can’t find decent exchange places. As I said in my first answer, BOT exchange rates for SEA currencies can suck (because the buy/sell spread is quite large). Ergo, don’t buy these currencies inside Taiwan. I’ve never had an issue exchanging TWD in SEA and I’ve consistently been able to find excellent rates. For example, for Thailand, try googling “super rich” for a good exchange place (there are others) - the current buy and sell rates are 0.990/1.005, so a margin of 1.5%. For KL, there are several exchange places around Bukit Bintang that had similarly small margins when I was last there. For Cebu, the first random place I went into had good rates too. Similar situation in Manila.