"This depends on the duration of your stay. According to Thai tax law, anyone who stays in Thailand for over 180 days out of a calendar year will be considered a tax resident by the Thai government. You will be liable to pay Thai income taxes on your foreign income if you are a tax resident."
Sorry; you misunderstand. It's a retorical question. Because you aren't a Thai citizen, or have a proper, non tourist visa, you can not have a bank account in Thailand. Same like in most parts of the civilized world.