Online and digital marketing are growing and exciting marketing channels for many companies. Especially due to their rapid growth and the corresponding current technological development, many actors have trouble keeping a clear view of marketing techniques and their consequences. In many market segments, high-pressure competition can often lead companies to resort to measures that verge on the illegal. Even with typical questions, from “Which data can I gather?” to “What can I post?” to “When am I liable for a service provider?”, different fields of law must be taken into account. There are many gray areas and important fundamental questions for online marketing professionals.