I've followed the tutorial to get Play Store working on Sailfish, transfered "system" folder", got root privileges (checked afterwards with whoami), ran the rsync command without any issue, rebooted, installed the .apk files, and yet Play Stores crashes the second I launch it. Anything I did wrong? I ran rsync from Fingerterm on the Jolla itself.

Ah. OK. I would surely ask why so, if I wasn't on your ignore list for reasons I don't really get. :<