If something can be destroyed by the truth, then it should be. If a crypto company abuses DMCA to fight this, then they deserve the Streisand effect. You should send the materials to someone in a free country where DMCA doesn't apply and speech is still free, and they can host the documents and discussion.
Someone should issue a counter notice. And get them put back up.
What's interesting to me is what happens if StackExchange put these back up, and then the cryptocompany sends a DMCA to SE's hosts.