Guess what I found in /home/{user}/.wine/drive_c/users/{user}/Temp, 10GB of log files. Although 9GB was from one time when I used Cheat Engine and I don’t know what really happened tbh besides it causing a OOM crash.
It created a 9GB sized file called ADDRESSES.TMP, I never considered checking for temp files in .wine before. And I guess I should be checking all the prefixes created by Steam games as well…