A-ha ha ha ha... heeeeeeyyy...
So here's the thing about Cyn - pretty much everyone in the fandom has a different opinion on her. Liam didn't elaborate on her herself during the show's run, and even her voice actress (Alannah "Fitzy" Fitzgerald) has confessed to having literally no idea what actually happened to her. So basically what I'm saying is in asking this question you're going to get a lot of different answers.
But your post ended up across my dashboard. And now, you're going to get my perspective.
So hi. I'm Myrah. I've been writing a fanfiction about this for about the last three-ish years. Strap in big dog here we go:
Cyn was a worker drone utilized by some family for a while until for some reason or another they decided to disassemble and deactivate her, sending her to a scrapyard relatively close to the estate of the Elliott family (often referred to by the fandom as "Elliott Manor" or "Elliott Mansion"). The virus used to deactivate her (wdOS_606) is a common one, "federally" standardized to deactivate all worker drones*. Following injection and successful upload of this virus, a worker drone "core**" - as revealed in episode 5 - has a .01% chance of rebooting. Furthermore, in the case of a reboot, the drone has a .7% chance of coming back online with a "potentially hazardous mutation," assumed (by me at least) to be the Solver under corpo-speak.
So essentially, Cyn is the unluckiest drone in the entire universe to have not only rebooted from an attempt at total shutdown, but done so Solely With The Assistance Of The Solver. Don't believe me? Take this:
(I stole this image from a Discord room a few years ago and don't remember who I took it from now, my apologies but image does not belong to me)
This is a wall of text that appears on Cyn's visor for HALF A SECOND upon her reboot in the scrapyard. What we observe here is a largely one-sided conversation occurring between Cyn and The Solver that basically says "Hey buddy looks like you're dead, that sucks, wanna give me some admin perms so I can fix that?" And Cyn, positively terrified in this position, grants it access because Why The Fuck Wouldn't She***?
From there it's assumed that she experienced a slow decline in her bodily function as she was pushed farther and farther away from control of herself (but kept conscious in the hivemind of the Solver due to the fact that she's the main host and her body is necessary) until she completely lost any access to the outside world. Now if you're me, you can choose to believe that after Uzi assumes the position of the main host and gets a handle on the Solver, Cyn is finally able to crawl her way out from the center of it all and gets the opportunity to make up for lost time, but that's if you're me (and maybe 20% of the fandom at large but don't quote me on that). As far as canon goes, "Cyn" herself (if she exists in the respect that I think she does) is effectively gone, a prisoner of her own mind while her body commits the attrocities against humanity and drone-kind that we witness in the show, silently haunting the narrative for those who loved her.
Basically if you think about her like I do she's damn near one of the most tragic characters in the show. But that's just me.
*This is an assumption; as the tape at the beginning of episode 5 does state "more than undead FEDERAL fine hazards," so I assume there had to be some level of standardization at the federal level if you can be fined for it.
**Worker drones do not have a core in the same way we see them, as in fleshy and very very Solver-y. Organic material doesn't exist in a typical worker drone, so the "core" as written here simply refers to the central mechanism that Does exist in a drone to keep its OSs intact.
***Now this part gets tricky as far as the fandom goes; many people believe that "Cyn" ceased to exist the second she came back online, others appear to believe that there isn't a distinction between Cyn and the Solver, some believe that there is but Cyn was vengeful after being thrown out and didn't mind the actions being taken - Liam never REALLY elaborates but seeing as she proceeds to lie there at the bottom of a pile of corpses with the same terrified look we've seen from several drones at this point, I choose to believe Cyn herself Does exist separately from the Solver and was extremely opposed to the actions it was taking in her name, but since she was deprived of all autonomy in this process, she was forcibly reduced to a horrified child this whole time.
