they dont need to brick the machine - they can simply ban your online account, which they can use EULA to make you agree to before getting that account. You lose your games if the game requires online verification (which implies an account). This way, you won't be able to play your games purchased, even if it's a physical copy - you can only play games that don't have verification like this (i dont own a switch, so i dont know if this is actually true).
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they dont need to brick the machine - they can simply ban your online account, which they can use EULA to make you agree to before getting that account. You lose your games if the game requires online verification (which implies an account). This way, you won't be able to play your games purchased, even if it's a physical copy - you can only play games that don't have verification like this (i dont own a switch, so i dont know if this is actually true).