When first subscribing to Cloudinary, certain types may be restricted by default on your account, to protect your quotas from being abused or misused by others. For example URLs of type fetch are automatically restricted with new accounts.
Those limitations are all customizable via your account security settings page. "check" a box if you wish to restrict the access to certain type of feature and "uncheck" to allow it. Note that while changes in settings take effect immediately, broken URLs may be temporarily cached on the CDN.
Also, restrictions are only enforced when accessing non-existing assets (pre-existing ones will still be available).Furthermore, this limitation can always be bypassed using signed URLs.