In their guidelines, the services state that minors may only make purchases with the consent of their legal guardians. However, they do not explicitly obtain this consent. In the case of the functions, they partly rely on access restrictions based on the age information given when registering. In the interest of participation and to support the development of financial literacy among young users, targeted support would be desirable instead of exclusion.
The report "Purchase functions in social media" by jugendschutz.net provides insight into the functions, payment methods and prices offered by nine popular services.