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I think all of these reasons are good and fall under the "change the world" reason outlined in the article.

People seem to be misinterpreting the article by assuming that these can't be factors at all. It's pretty clear that everyone needs an income. These should be interpreted as primary reasons and that I agree with completely.

If your primary goal is to make yourself money or get power, it is guaranteed that the rest of your company does not share your vision and if they knew about it, they would probably try to find other jobs.