This person just shared (for free) tons of experience, knowledge and insight into thinking/problem-solving process, for others to enjoy and learn from - and your only comment is attack on them for "stealing" somehow, by not sending e.g. 300 WA messages, but instead kilobytes of HN content?

How much would you calculate was stolen this way? Based on which factors?

As a side note, those pesky "tech people" are most certainly not THE most paid profession, now or ever.