Is it illegal to print advertisements on cups?

It's not illegal, they're fooling around! Now, in order to maintain their old customers and develop new customers, enterprises will make some advertising gifts appropriately-that is, stick their company's logo on cups, umbrellas, mouse pads and other gifts as publicity. Give back to customers. But these gifts are not made by our own company, but as some publicity tools. For example, both China Mobile and China Unicom have gifts given along with their business, and banks also give away points. Do these companies have the right to produce gifts? Another example is the bus advertisement. Do advertisers have the right to produce buses? Completely irrelevant, nonsense! We are a company specializing in making gifts. Where else can I live if I want to break the law?