A point I've not yet seen mentioned.
I have two Kasikorn accounts, basically dormant with a couple of thousand GBP in deposits.
Having not browsed them online in years this latest palava piqued my interest and I logged in to a new and unfamiliar website.
I was surprised to be steered to this 'K Biz' hype and to find both accounts being declared as BUSINESS ACCOUNTS. These are not and never were anything but personal accounts.
The call centre tells me that now that they've rebranded their website, there are only business accounts, "yours are personal accounts. JUST IGNORE WHAT IT SAYS!!!" (sic)
With the prospect of this heralded inception of notifying overseas tax depts, I wonder if they would be as dismissive of one of their nationals suddenly having sprouted undeclared business bank accounts overseas