Perfectly ethical:
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Content that is Inaccessible legally such as old games, abandonware, delisted media, banned stuff etc.
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Digital copies of physical content you own
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Digital Content that you already own such as ebooks or movies, but are restricted access due to DRM or single-copy rules or other dumb stuff. If I paid for something I should have the right to access it however I want (as long as I don't distribute it)
Gray Area:
- Pirating work that benefits a publisher but not the creator. Movies, Shows, and Songs released by studios that exploited the creators of that material and not giving them a cent. This includes scientific work and research.
Pop Culture Detective - probably my favourite out of the millions of video-essay makers