Polish community has a lot of curation initiatives. They have a bot for voting their content @diosbot. Also, they have a handy webpage to grant the posting role to trusted curators (https://wise.vote/)...

The last thing I knew about them is that they have an orderly system of tags to classify and curate their content. They do so through this account @steemit-polska

I knew about them thanks to this post
https://steempeak.com/spanish/@jacekw/hello-spanish-community-we-are-polish-community-we-would-like-to-know-more-about-you

Best regards.