@collectifission The chart above shows StackOverflow was in steep decline before ChatGPT was even introduced.
Meanwhile, at the peak of StackOverflow back around 2014, one of the co-founders took what they learned about what worked and didn't work about building communities online and created Discourse. Here's the popularity of Discourse in Github Stars since launch.
Discourse remains popular today and does not have the reputation for toxicity that SO developed.