Author here. This is not related to this discussion, but does anybody know what causes these lines to appear in my server logs?

  <REDACTED> - - [14/Feb/2021:22:26:45 +0100] "GET /posts/the-complexity-that-lives-in-the-gui/ HTTP/1.1" 200 16798 "-" "HackerNews/1391 CFNetwork/1220.1 Darwin/20.3.0"
  <REDACTED> - - [14/Feb/2021:22:26:45 +0100] "GET /posts/the-complexity-that-lives-in-the-gui/ HTTP/1.1" 200 16798 "-" "HackerNews/1391 CFNetwork/1220.1 Darwin/20.3.0"
  <REDACTED> - - [14/Feb/2021:22:26:45 +0100] "GET /posts/the-complexity-that-lives-in-the-gui/ HTTP/1.1" 200 16798 "-" "HackerNews/1391 CFNetwork/1220.1 Darwin/20.3.0"

The requests usually come from a certain ip multiple times until fail2ban bans it. It's not just one offender, there are multiple behaving like that.