Amazon Multi-Channel Fulfillment is not against the rules. It is a service provided by Amazon that helps sellers deliver their products to buyers on other sales channels. This service allows sellers to better manage their inventory and expand their sales channels.

But it should be noted that before using Amazon Multi-Channel Fulfillment, sellers need to understand and comply with relevant policies and regulations, and ensure that their products meet Amazon's quality standards. At the same time, sellers need to provide accurate product information and shipping information to ensure that the goods can reach the buyer on time. If the seller violates Amazon's policies or regulations, it may cause the account to be suspended or closed, and may even face legal liability. Therefore, sellers need to use Amazon Multi-Channel Fulfillment with caution and comply with relevant regulations.