There are online video + ebook hosting platforms like Thinkific or Teachable that allow you to do that without the need for custom development, those are turnkey solutions.
Typically there are only a few subjects for each one given person is willing to pay for content, because we typically have only 2 to 3 major interests that we really want to dive deeper into at any given time.
It depends on the type of content, if its for example chess lessons then a membership site makes sense, its a never ending subject.
If its high-value educational content then it makes much more sense to build your own website, rather than be dependent of these platforms.
Historically, content creators have always been exploited by the middleman that gets the lion share of the profit, and because of that there is a lot of content that never got created not because it does not have a market, but because its unsustainable to creators due to the middleman and their control of the relationship with consumers.
The internet does allow us to remove the middleman for the case of lots of content creators, but instead, people are spending a lot of time and energy trying to make it in these platforms only for them to change the rules every two years.