@Wraithe @vkc @niko
Based on what I'm reading basically there is no block list sent to anyone. The user you blocked receives a notification in their inbox.
They could still log peoples' preferences by setting up honeypot accounts and servers to get blocked. They'd not be able to just scrape or watch a public database for the info though.
Bluesky should remove the block feature. It can't be implemented in that architecture. The public processing pipeline discludes the possibility.