I had completely opposite experience when I was actively participating in maintenance of medium size project. Waves of randomly generated pull requests and issu

I had completely opposite experience when I was actively participating in maintenance of medium size project. Waves of randomly generated pull requests and issues containing randomly inserted words with usernames that seemed to follow similar pattern. Dozens per day if not hour. Reported them countless times but there was no reaction from Github beside the initial automatic response, even after half a year those accounts where still there. Only thing that somewhat helped was limiting PR and issues to contributors for a week or so (which is bad for users). Afterwards it was possible to turn them back on for everyone. But after few months of silence the bots where back. The whole thing was slightly bizarre. And their goal was unclear. The messages never contained any actual ads or links. It looked like someone is trying to simulate real accounts behavior. Those accounts where doing similar thing to other real repositories and also making nonsensical activity in each others forks of real projects. Maybe the person was still testing how to avoid bot detection. Or maybe the goal was accumulating accounts which could later be used for selling stars.