Wrong. You’re assessable for tax on worldwide earnings according to this article irrespective of amount. 1 bn talks about a platform not an individual.
Not strictly true. If your hypothetical tax in country B Thailand would be higher than what you’ve already paid in country A, you are liable to pay the difference.
That won’t make you non tax resident. If you spend a total of 180 days here in a tax year you’re tax resident. It’s not 180
days consecutively it’s 180 days in total….