A Microsoft file hosting and synchronization service.
OneDrive is the feature that finally made me give up on windows permanently. This is just straight up deceptive data theft. It constantly re-enables itself with updates. It points other programs pathing back to it even after it was disabled which re-activates it when it is referenced. At this point Steam is the only reason I have windows installed at all, and as soon as I have a workaround for that it's gone from my life forever.
Don't. Touch. My. Data. Without. My. Consent. Simple stuff. This behavior never was and will never be acceptable. Theft is not acceptable. Pre-emptively moving my stuff or changing my settings without my consent or knowledge to "accidentally" move my private files into the cloud is still theft no matter how you wrap it. It is not accidental when it is intentionally programmed to be deceptive, convoluted to disable, reset to defaults whenever an update happens, and moves/edits/deletes files by default without permission. Theft is theft and no word salad non-answer will make it anything except that.
I don't care if that's how it was designed, it was designed poorly to slurp up private end user files without end user knowledge. The replies forwarding to "contact your administrator", this is windows home I AM THE ADMINISTRATOR FFS. God forbid anyone on this site ever recognize a behavior that is massively unwanted as a mistake or give a real answer to a question like "how do I permanently disable this thing that keeps re-enabling itself" with yet another instruction to disable the settings that revert on their own anyways, which is generally never the question that was actually asked.
It is completely unhelpful to give canned corporate network answers to home users. Given that they can't handle basic home pc use, I wouldn't put this garbage in a business where trade secrets have to be protected if my life depended on it.