As mentioned in the last article, it is not possible to define exactly what a robo-advisor is, as the individual providers offer a range of services of varying breadth. In fact, robo-advisors have long since ceased to offer mere recommendations or advice, and most providers are steadily expanding their services into a fully integrated solution. Accordingly, people now associate a robo-advisor with a platform that can also be used to make an investment directly (see [Bloch/Vins 2017, 114]). However, this service, for example, is linked to certain regulatory requirements, which are presented below. It should be noted here that this is the regulatory framework in Germany. In terms of regulation, four business models can be distinguished in the area of robo advisory services: