I doubt Anthropic has enough computing resources, to satisfy demand for Fable. More so with long 1M context many users take full advantage off. On other side they needed to make Fable public, in "trial version" so people could independently experiment and verify it.

I think this ban is the best outcome for Anthropic. It means they want bleed out cash and compute, gave them cheap publicity, and allowed users to try it! Actual paying customers will still get full access!