Interesting, didn't know this. This seems to be similar to AGB-Law, albeit pretty weak. While the US "contract of adhesion" [1] concept protects against terms "outside of the reasonable expectations", the AGB-Law [2] also protects against terms that are "unreasonably to the disadvantage" of the consumer. Arbitration clauses are not valid, for example.
[1] https://en.wikipedia.org/wiki/Standard_form_contract#Contrac...
[2] https://www.buzer.de/s1.htm?g=BGB&a=305-310