Whoever earlier mentioned that a workaround for this is setting up 2-factor authentication is correct - there is an optional checkmark for trusting the device when entering a 2-factor code, which is unchecked by default. It's a good idea for a payment service to use this anyway, and I'm glad I finally set it up... Still, this should NOT be necessary to stop this behaviour - if they want to make it easier for people, that should still be opt-in, not opt-out, and certainly not opt-out EVERY TIME.
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