They list out their reasons here https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes/#exclusions https://seirdy.one/posts/2021/03/10/search-engi

They list out their reasons here https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes/#exclusions https://seirdy.one/posts/2021/03/10/search-engines-with-own-... Sounds like two were excluded for having a far-right focus, one for crypto payments, and the rest for being small/simple proof-of-concepts That said, I would also be interested in what engines in particular were excluded, with a small blurb as to why it wasn't included.