I take such to another desktop to boot Linux and see if it's gone. If it's that far gone to show zero in size and nothing in Linux then it's one for the data recovery houses as no software brings those back.

As to your personal files, I do encounter an occasional person that was never reminded to backup what they can't lose. But that is increasing with smart phone use because of the millions of smart phones today and an industry that doesn't want to spook the herd.

I shared an inside view of data recovery houses at https://www.cnet.com/forums/discussions/a-look-behind-the-scenes-on-hdd-recovery/