Microsoft quietly changed how folder backup works in the OneDrive app on Windows 11. Now, the OS enables it by default during the initial setup without asking the user for permission.
You can uninstall it and it will still retain some weird connection with your folders where stuff still saves to a one-drive folder which becomes impossible to delete or use normally, unless you re-install one-drive and do a bunch of stuff in the one-drive program-specific settings, and then re-un-install it, in which case it might stick.
Admittedly, I haven't messed with add/remove programs for a bit, but last time I did, it seems like they locked all the Microsoft brand programs down, no?
Ugh, I wish I had the time and dedication to find the registry keys and disable them and to keep up as the keys change with each update.