Bitcoin is illegal?? even punishable??

The latest news about Bitcoin are frightening.
There exist a way to write hidden massages on the blockchain, which will be saved like a trancaction.
German University Achen found out, that on the blockchain is child pornography saved and linked for tor-sites with more stuff like that.
Which could mean the blockchain is illegal because this information are part of the blockchain.

The worst case could be closing or forbid bitcoin.
The next time will show how the judgements will handle this.

hope this takes a good end.