A THB balance at Wise? There's no such thing, is there? Wise doesn't deal in THB. It displays your balance in both THB and the various currencies you hold with them, that's all. I think! I don't have a Wise card though.
With a Thai ATM card I'm charged 15 THB for a 20k THB withdrawal, and I have an out of town account.
And my tax paid UK income won't be taxed here as the UK and Thailand have a tax agreement covering dual taxation. But, income from untaxed assets abroad could well be taxed once transferred to a Thai account.