Are you blocking the individual users, or the domain? I've heard that domain blocking is buggy, so try unblocking any domains and see if it helps. It also isn't supposed to block instances, just posts that link to the blocked domain.
Fediverse
This magazine is dedicated to discussions on the federated social networking ecosystem, which includes decentralized and open-source social media platforms. Whether you are a user, developer, or simply interested in the concept of decentralized social media, this is the place for you. Here you can share your knowledge, ask questions, and engage in discussions on topics such as the benefits and challenges of decentralized social media, new and existing federated platforms, and more. From the latest developments and trends to ethical considerations and the future of federated social media, this category covers a wide range of topics related to the Fediverse.
The Devs are hard at work, there is just a lot for them to do. You can see the most recent PRs here. You can raise an issue here for more visibility:
https://codeberg.org/Kbin/kbin-core/issues