For those not reading the story, which appears to be many, the company that services the implant went bankrupt. The implant was experimental. There exists no one to service it any longer. It will pose a health risk down the road without someone servicing it.

The story doesn't directly say that's why it had to be removed (and she talks about wanting to buy it). I found another source that explains that the device came with a three-year battery life.

https://www.msn.com/en-us/health/medical/tiny-computer-in-woman-s-brain-changed-her-life-then-she-was-forced-to-get-it-removed/ar-AA1cfm2V