In the mid 80’s worked for a Unix shop. If there is anything I’m going to say it’s this: Erase and scrub your hard drives before sending them in. If you’re sending it in for data recovery then you’re SOL.
If it’s terribly important and sensitive and you simply must have it recovered you have them do the recovery while you’re watching them.
Early on when I started using computers I had a problem and needed a recovery of my hard drive. The guy who recovered it for me made some comments about my taxes. He had no clue but hinted he thought I had done something wrong, I hadn’t. I was PO’ed. I’ve never taken another computer for repair.