alt Hacker News> it's not (necessarily) related to Windows at all here as described in TFA.
The article doesn't claim that it's Windows related. The article is very clear in explaining that the spec requires =CRLF (3 characters), then mentions (in passing) that CRLF is the typical line ending on Windows, then speculates that someone replaced the two characters CRLF with a one character new line, as on Unix or other OSs.
Ok yeah I may have misinterpreted that bit in the article. It would be a totally reasonable assumption if you didn't happen to know that about email though, it wasn't a judgement regardless.