Promoting products that are on backorder is usually allowed, but it comes with some risk. Backorder means the product is out of stock and customers will have to wait before it ships. You can still earn commission if the company accepts the order and processes the payment. The problem happens when customers get tired of waiting and cancel their orders. When this happens, the affiliate commission gets canceled too. This is why it is better to tell people clearly that delivery may take time. Do you think promoting backorder products is a good idea for long term trust?