chuso

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.

Meta has practically unlimited resources. They will make access to the fediverse fast with their top tier servers.

Well, that hasn’t been my experience so far, and they are not even federating yet :-D