If someone (No Licensing) powered by nopcommerce removes , what will happen?
Nothing happens, please relax
According to The World Intellectual Property Organization Copyright Treaty (the treaty has been ratified by 95 states), The Digital Millennium Copyright Act (the United States copyright law), Copyright Directive (officially the Directive of the European Union), site pages or an entire site which violate author’s rights might be removed from Google search results and from other search engines if an author whose rights were violated does such a request. In some cases, author’s rights violators might become financially liable. A store owner has a right to claim financial loss recovery from a site developer (unless a contract states directly that author’s rights violating actions are acceptable).
If you plan to continue work on nopCommerce, are interested in the platform’s development, care about your reputation and are not willing to get statements of claim from your customers, we recommend to follow the copyright notice removal key license requirements.
Apart from legal consequences, there is still human decency. What is the purpose of removing the copyright notice? nopCommerce is an open source software, you can download it, use, create fully functional online store for free, with bunch of free plugins, themes and it's the only one thing you can do for the author is to thumb up his work.