I don't think it matters who's at fault, I think Google should allow the user to extract all their data even after account termination, would be fine if they charged a reasonable fee even.
And it's not like they don't have the capability: the Google Takeout service packages up substantially all of your data on Google services in an archive for download.
Only if you take it out before your account is locked. When was the last time you ran a backup of your google account?