From a technical perspective, the big problem with tuning boxes is that you're essentially trying to 'fluff' what the computer is seeing, so that it dumps more fuel into the engine so it goes faster.
They usually do this by fluffing one or more sensor values to adjust how the engine behaves and by making assumptions as to how the cars computer will respond.
An actual remap changes the data, or map of how the car responds to various conditions, similarly by adjusting fueling, but the computer has a much better view of the overall state of the car, and you're not just fudging numbers to get extra performance out of it.
Realistically, if you're in a bad enough crash your insurer is investigating engine tuning, then they'll spot a tuning box quicker than they'll spot a remap, and you'd get quizzed as to why you were fumbling around the engine bay to remove bits. Either should be declared to insurance, Polestar is the most insurer and car-safe in that regard.
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