What do you mean by “others”? As far as I know the only company that will have access to anything will be MS, if using OneDrive.
In general I find this worry about third-party access to our files when using cloud services pretty overrated. Let’s face it, for the most part sane people who use this technology will make available media and maybe some other types of files that are all fairly low-value and low-risk.
Beside, I actually think MS has a good track record when it comes to guarding your data. I’ve seen zero reports of data breaches from OneDrive.