What happens when your files are considered Bad and Microsoft removes them? When the OneDrive backend suffers bit rot or misconfiguration? What happens when your Microsoft account is compromised? When the photos of your kids in the bath are sent to the police? When you have a 10GB file that's frequently modified and the client then constantly scans it and uploads it? When your abusive partner, relation, co-worker or boss uses this to surveil you, tamper with or remove your files or even plant evidence? When your business or organisation now suffers from liability from not performing due data protection diligence of something they were not informed nor asked consent for? The list of reasons why this is terrible just goes on and on.