I mean, companies exist specifically to do this for other big companies, I’m sure there are security procedures, background checks, NDAs and everything that needs to go with that.

Data recovery specialists exist, and nobody would pay for them if the data they were recovering wasn’t, you know, valuable enough to pay a specialist to maybe retrieve it. They probably deal with multimillion dollar industrial/financial/business secrets all the time, and do it discreetly, or else their business wouldn’t even exist.