There was Source Hut, the code repository/CI engine with the worst UI in existence. oh and the Hare programming language that nobody will ever use (including himself).
He started Sway/wl-roots. He was/is Howard Roark levels of uncompromising (from Ayn Rand's The Fountainhead), to the point where he made Sway unusable and fostered a toxic community.
Then when Hyprland made something that wasn't shit and actually tried to get things working for everyone, he got insanely jealous and went scorched earth on their project, actionally defaming people who were barely out of high school and just wanted to learn and write good stuff.
He's an insufferable self-righteous, mentally retarded vile and disgusting human being.