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Could have a look at peer tube, it is decentralised so depending on interest there may be a specific instance with the content you are looking for
it is not easy I will give you that, anything specific you are looking for and we can try and help
I will tag
in to see if they can also help
I am on https://diode.zone/ which is more science / tech related, if that helps
not sure about documentaries but lets see what the community can help with
@zleap I did have a look at Peertube but could not really find what I was looking for with ease.