That’s a very typical German mindset. You implicitly assume that nothing good can come out of Libra so it should be banned from the beginning. The pragmatic approach is to wait and see what happens. Most likely, it won’t be as successful as you assume it will be. Also, there are plenty of other forms of private money out there that you don’t seem to have a problem with (e.g. credit cards), as well as foreign currencies. Why do you think using Russian rubles for payments should be perfectly legal but using Libra for payments is completely evil? It does not make much sense to me.