chuso

It works for me, so the issue must be on your side (or they fixed the link)

I have no idea how it works under the hood, but I guess there is some caching given how fast results are retrieved.

This appears to be related to kiwi farms?

It was originally developed by Kiwi Farms when they were running their own Mastodon instance.
They built this tool because they were being massively defederated (for obvious reasons) but eventually gave up and closed their Mastodon instance.
Since then, other instances apparently not related to Kiwi Farms (but usually still that kind of “free speech” ones) have reinstantiated the service.

It also has a slur immediately on the page you linked

Oh, yes, I haven’t seen that.

fedi-block-api already existed and works with any fediverse instance, not only Lemmy.