I'm not sure I understand, disable access to the blocklists? That's up to the frontend Tesseract, it doesn't interact with lemmy or piefed. It's the frontend that is developed independently from either choosing not to display posts depending on the dev's weird list.

As for piefed, the main dev has his own strongly opinionated lists that he maintains. Most of them can be disabled by the admins who set up a piefed instance.