Illegal. First of all, if you don’t have a business license, it is illegal as a production unit. When it comes to pre-production, the illegal behavior is more serious. Even more serious, for example, if some food is produced without a license, it may also involve criminal offenses. As for imitating other people's products, first of all, you cannot use other people's trademarks, otherwise it will infringe other people's exclusive rights to register trademarks. Secondly, if other people's products are patented, you cannot produce them without authorization.