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FYI, https://easterneuropeanmovies.com/ is a thing that exists.
(Watch popular Eastern European movies, with subtitles.)
Also just fun to browse the amazing artwork that some of them have. (CW nudity) https://easterneuropeanmovies.com/sci-fi
Sorry, I should have said: The site is not free, but has pretty transparent and reasonable pricing (you pay for either a day or a week or a month, some movies are only available at the higher tiers, but it's always shown beforehand)