https://www.heise.de/en/news/Notepad-updater-installed-malwa...
https://doublepulsar.com/small-numbers-of-notepad-users-repo...
The TLDR is that until version 8.8.7 of Notepad++, the developer used a self-signed certificate, which was available in the Github source code. The author enabled this by not following best practices.
The "good news" is that the attacks were very targeted and seemed to involve hands on keyboard attacks against folks in Asia.
Blaming the hosting company is kind of shady, as the author should own at least some level of the blame for this.