For many years, Netflix has allowed teachers to screen documentaries in their classrooms: https://help.netflix.com/en/node/57695

As part of their pandemic response, Netflix expanded access to a selection of these documentaries and made them available through their YouTube channel, without a subscription:

Netflix Educational Documentaries on YouTube

While this selection is just a tiny fraction of their offerings, it includes a number of high demand titles such as 13th and the series Abstract: the Art of Design.

Selections may vary.