The role of censorship that the government used to have has shifted to companies like Visa, Mastercard, Amazon, etc. If you try and sell a spicy enough book, they will make sure nobody reads it, and the government can be completely "hands-off".

They can fail to process the customer's payment, remove your book from the marketplace, and ban your account. If you try to build your own marketplace, you won't be able to use any major payment processors.

Modern dissidents are building alternatives, but still there are roadblocks. All this to say, books are still very much being suppressed.