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it’s really harsh to say that. I’m sure many people appreciate the material and effort

Not to take away anything from this but I think there are plenty more valuable resources available for free on the web on this topic.

The author (OP of this post) has a page listing some of those free resources available on the web: https://learnbyexample.github.io/curated_resources/vim.html

People appreciate lots of pointless things, and people like to profit from it. Such is life.