@karellen

It seems a little more complicated than that. If you read back a bit, in one of my comments I mention only making an Opera-acc just to post this thread. So it started happening before I had one. Also I reverted back to ver.67.0.3575.97 and that has been running mostly without issues. (Though google keeps signing me out, so I periodically need to log back in.) I'm too afraid to try updating again, to be honest, it's just a lot of hassle to get it back into a functional state.

@leocg
Ok, I'm still a little lost on this forum, but managed to find it. I didn't make a new profile per se, but I did delete those folders before the re-install, which should be equivalent(?).
@osyu
I ended up running out of time to investigate, so I looked for an installer for a slightly older version (found it here somewhere) installed that, and renamed the auto-updater to something else for the time being.
I saw that ideally someone who posts here should also list the specs so here goes:
CPU: Ryzen 7 1700
RAM: 2x8GB HyperX Fury Black
MOBO: ASUS B350m TUF Gaming
GPU: RTX 2070
STORAGE 256GB m.2 SSD (this is where Opera is installed) + ~7TB of HDDs
Thanks for pointing me into the right direction, once the finals are over, I'm gonna revisit this and hopefully find a more permanent solution.

Not sure how I would do that. I didn't have an Opera account, I made one just to ask, about an hour ago, so if the profile is linked to an account, I didn't have one, and if it's stored locally, then I guess the full-reset / reinstall should have gotten rid of it.

I've been using opera as my default browser for more than 2 years now, and had an overall positive experience with it. But ever since i turned my PC on today morning, it has crashed every single time roughly 1 minute after I opened it.
What I've done in an attempt to fix this:
-Restarted.
-Checked for updates (there were none, so I'm guessing I'm running the newest versions - 68.0.3618.63).
-Tried disabling all my extensions, and closing all the tabs.
-Tried to recover with my files intact.
-Tried to recover with a full-reset.
-Tried updating Windows.
-Tried completely removing Opera and reinstalling it.
None of these steps worked. I think I will switch do GX/download an older version for the time being. If anybody know what may cause this or how can I narrow it down to something specific, I would appreciate the help, because this is incredibly inconvenient.