IPFS is a protocol like http or bittorrent, rather than a platform like Twitter. It is a federated file storage, so although individual contributors can choose not to host z-lib or allow it through their gateway, there is not single authority that can ban content.

A better question is - is this a sensible technology for hosting legally dangerous material, and the answer has to be no. It is censorship resistant not anonymising. Like bittorrent but kind of worse. It is trivial for an enforcement agent to find all the servers in the world hosting a particular e.g. book and go after them.

I am sympathetic to your ethical question, but I'm just answering you on the technical side which is - your question doesn't really make sense but this is a bad idea.