I posted my problem on Stack Overflow, but as of right now haven't received any answers. 

Link: https://stackoverflow.com/questions/58922332/shutil-cannot-delete-a-folder-with-a-hidden-desktop-ini-file

To summarize my problem: If you use copytree to copy a source folder that contains a desktop.ini file to a destination, and then call rmtree() to remove the source folder, it will throw an error indicating it doesn't have permission to remove the folder. Using ignore_patterns() doesn't help either, or to quote my problem on SO:

It seems once the source contains a .ini file, even if it isn't copied to the destination, rmtree() will have a problem removing the source folder.

Powershell has almost the same issue, however, unlike Python, if you tell PS to ignore the .ini file, it will remove the folder without crashing.

rmtree has no problem removing folders containing 0 ini files.