There is another half to the quandry and that is if Akane doesnt register Nadeshiko then she is stealable. And having another person register would at worst be like abduktion and brainwashing and at best being forcefully married to a stranger
I mean that's just one worm in the huge can that is the entire problematic of sentient machines as property.
I honestly don't see this really happening in our reality because of 3 reasons; human rights law, manufacturing & economics. Robots are complicated & expensive, especially humanoid android (the human face alone can have upto 30 muscles depending on how they're counted). To make a humanoid robot would require a lot of money, resources & programming to get these devices up & running. Technologically it's very possible but economically it would incur massive financial loses.
The second humanoid sentient robots are granted human rights, the companies would only be making a loss on their creation and so, they wouldn't. The modern supply chain issues is a great example of why pulling this off in secret is practically impossible on a large scale.
Then imagine the maintenance involved. How often do you need to take your car to get checked up or repaired? One of the fundamentals of engineering is the more moving parts there are the easier for the system to fail. Then what happens if a robotics manufacturing company inevitably runs out of money & goes bankrupt, like what happens with cars?
No-way could this happen unless the robots were all programmed with self-building, self-repair & a wireless cooperation network.