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It's difficult to extract anything from an RPG without participating in it. For an outsider, reading more than 20 pages of text that they don't fully understand can be challenging. Moreover, there are usually around 3 groups of players, each writing at their own convenient time, which can lead to inconsistencies, making it even harder to navigate and find any worthwhile ideas. An RPG is more like a collection of unexpected and logical solutions to various situations that arise from, let's say, collective creativity.
An RPG on a portal is a text-based game, primarily interesting for its participants, but it's not a book.