You can find multiple comments on past OneDrive posts from people who are/were at Microsoft with frankly terrifying stories of them losing their own or customer data. They all said the same thing: Do not use or trust OneDrive.

IIRC one of the funnier examples was users, their managers, and so on all the way up the chain (perhaps including HR and Legal) being let go resulting in there being no user to transfer the ownership/access to so it was simply deleted.