abuse@eingang.cc -- a person reads it, in German or English.
Addresses are retired, and senders blocked, when the service is used to receive mail for accounts opened in somebody else's name, for fraud, or for anything unlawful. If mail meant for you has been delivered to an address on this domain, send the address and roughly when it arrived: the address is retired so that nothing more reaches it, and what is already in the mailbox goes at the 30-day mark like everything else.
We cannot stop anybody typing an address from this domain into a form somewhere. The only real protection is that nothing sent here is private in the first place.