That would paint a huge red target mark on filecoin's back, given that they raised over a quarter-billion. They would take it down faster than you can have an 8TB HDD shipped to you.
They can and will use legal means to go after anyone trying to use the network this way in order to make the content less discoverable and discourage others from following suit.
Being coined as the Napster on Blockchain is the worst possible PR one can think of in their situation.
But why would it, really? At this point it absolutely plans to rejoin world economy once things "blow over". And if becomes clear that it's not going to happen - there is even less reason to host some books in foreign languages that probably have "extremist" content in them.