It’s funny how naive smart people can be sometimes. Take the founders of Substack, a US-based online platform that enables writers to send digital newsletters directly to subscribers. It also enables them to earn money from their writing if they wish to, though as far as I can see, most don’t. I can personally testify to its merits. I’ve been a blogger for ever, but when Covid-19 arrived, I decided to also publish my blog as a free daily newsletter and started to look around for a way of doing that. Substack fitted the bill and it’s delivered the goods;...