That's why I said a few times the story had some huge weaknesses and plot holes. I mean, who on Earth would create a legal and financial nightmare for their company by releasing to the public civilian market a domestic android that pretty much instantly turns into a super human killing machine when the expiration date hits? Nobody, because the company would be sued to hell, assuming the country's officials somehow allowed such a deranged thing to be released in the first place. That's like a car that would automatically explode after a set number of kilometers/miles were driven. Instead of, like, not starting anymore or something.
So, when you have stuff like that, you just have to accept certain things - or drop the show. That's why there's nothing that could be done about the expiring Giftia. That's it. Like you can't do anything about an expiring human if it's terminal. Naturally there are a bunch of anime about dying humans as well, like the recent Shigatsu, to name one.
It exists so that not every show would be the same. In my opinion, on which I agree with Shinta, this was established as such a show from early on. We had those typical (somewhat) Japanese company employees who are just cogs in a big machine, not the more regular world saving heroes (like school kids or mecha pilots). In addition, they were working for the product end of life department, which means we were seeing the same stuff happen time after time, only for some third persons. Under such circustances it's natural progress it will all finish with that continuous theme happening to the main character.