Which approach to sustainability of open textbook projects do you favor? (poll 1045860)

Which approach to sustainability of open textbook projects do you favor?

Development of open content supported by institutional subscriptions.

Development and remixing of content donated with an open license by volunteers (e.g., Connexions).

Commercial authoring approach combined with a strong marketing program (e.g., Flat World Knowledge).

Other:

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See this poll on: https://poll.fm/1045860/embed