I know someone who does very well off a how-to website, no payments but advertising and evergreen content. Especially since customers are Linuxy, he might not w

I know someone who does very well off a how-to website, no payments but advertising and evergreen content. Especially since customers are Linuxy, he might not want to put a paywall up unless he's very sure. Alternatively, create videos for tools that only real companies would use and charge for those. E.g. Puppet, Chef etc.