The CUDA tag too had a vigilante whose profile read
Once upon a time there was a emerging technology called CUDA, which offered all sorts of really intriguing new possibilities in scientific and parallel computation. And once upon a time, Stack Overflow was full of interesting questions about CUDA, and how to use it. So I started answering them. Eventually I answered almost 700 questions, became Stack Overflow's highest reputation participant on the CUDA tag, and had a lot of fun doing it.
Alas, CUDA is now very mature and most of the good questions about CUDA have already been asked and answered. What appears on Stack Overflow today is mostly dross, and I spend most of my time editing, down-voting and closing rather than answering questions. Those answers I add are community wiki entries (over 200 300 400 500 600 700 at the time of writing). A lot of toil has gotten and kept the unanswered question queue down to about 10% 7% 4% 3% of the total number of CUDA questions for a good part of my tenure here.
Result, most CUDA questions got downvoted and then deleted. Oddly though CUDA continues to evolve.