What's with posting this in multiple blogs? Is it some SEO or marketing strategy?

https://webup.org/blog/the-emerging-ship/

https://webdesigntips.blog/web-design/javascript/developers-...

https://lzomedia.com/blog/developers-in-charge-of-a-failing-...

https://aster.cloud/2021/02/11/how-can-developers-save-a-fai...

That aside, I was actually more curious to read the mentioned "Thoughts on mistakes" essay, but it was apparently published only in newsletter form because the link in the article leads to the newsletter subscription page.