Under CRS banks have ability to exchange information, so my bank can request information from the Australian Tax Office to ensure I'm paying tax somewhere.
What's changed is the freezing of mule accounts, so agents can no longer provide the 800k required for extensions of stay. This has only occured in the last few weeks. I think bank staff have been told to stop taking bribes
What they're doing is seeking tax residency status. Bangkok Bank requested my Australian tax file number about a month ago and also took a photo of me!