Just to add that it was the worst performer because the tester made some mistake when doing said markdown test. When he corrected the test it was nowhere near the worst, but it was already to late.
Some people (tester included) tried to reason with the dev, but to no avail. I think he was scared because he was using his real name in github, and didn't want to have bad code in his résumé or something like that.
IMHO, the dev overreacted. But it's his project so it's is decision.
Some people forked the project before it went down, so maybe we can see a comeback in the future.
I was using it has my main Lemmy client, but no big deal. Fortunately there's a lot of clients to choose from.