This is going to become a bigger and bigger problem
The average consumer is completely unaware something like this might happen, and could render their expensive internet connected fridge, TV, doorbell, etc. without the extra "smart" functionality they thought they were paying for, or in the worst case without any functionality at all.
I can't imagine there won't be some laws written before long to address this. Presumably in Europe, since they care about consumers at least a little. Unlike the US where any whiny owners will be told "buyer beware" and we should put our full trust in the free market to magically solve this problem for us.