At a minimum, one should be able to cut off access to the internet so a company can't EoS killswitch it/pull a Nintendo and send an EoS fuck you update that breaks any attempts to put control in the user's hands
Mind, that's a really fucking low bar, and would be depressing if that's all regulation guaranteed
Yeah that bar is too low. Putting tech in someone to keep them alive or enhance their life somehow should come with some sort of permanent responsibility from somewhere. If the company goes bankrupt the expertise doesn't just vanish, then make it a public responsibility to ensure that whoever was granted eyesight from some kind of implant, gets to keep that. Hell, make the technology and research public as well.
Bodyparts/functions should belong entirely to whomever possess them, a company going bankrupt doesn't suddenly mean that someone should lose their ability to walk or whatever.
No company should be able to "own" someone's bodypart, or their ability to perform a certain task or whatever. The notion is preposterous.