@Ruth ******
I don't believe there is any rationale. I haven't been under the impression that either are related ie they were never presented to me as related. When I opened my accounts, none of the banks were pushing insurance or making it a condition of being able to open a bank account. Even when it did become something that was available, if you wanted it-around
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, from memory. It wasn't being as aggressively marketed as it is now. I imagine that managers/executives saw it as an extra way of bringing money in ie there was a market. Expats from the US, UK and Australia needed a Thai bank account to fulfil visa conditions for retirement and marriage visas. Lots of expats want insurance in Thailand, and the low cost (and relatively low coverage) of the plans the bank sell, are attractive to some foreigners. I don't recall anyone trying to link the insurance as being "needed" to make a deposit. It's just an extra product that the bank offer. I do think though it has morphed a bit into "You want something from me (to open a bank account), then you need to do something for me" (take out an insurance policy so that my manager gets off my back)