Web developer from Berlin
https://vincentwill.com/
I don't think that the guy who bought it was from the industry. In our talks, he really seemed interested in growing the project - but maybe I'm just naive.
If he really wanted to stop the project, he should've put the repository on private and put down the website, but he just left everything the same as it was.
I can add https://openingtrainer.com/ to the list. Also a great tool to practice openings
This project is an enhanced reader for Ycombinator Hacker News: https://news.ycombinator.com/.
The interface also allow to comment, post and interact with the original HN platform. Credentials are stored locally and are never sent to any server, you can check the source code here: https://github.com/GabrielePicco/hacker-news-rich.
For suggestions and features requests you can write me here: gabrielepicco.github.io