In a recent paper*, a bold statement was made that:
We find that relative to its Russian and Chinese counterparts, where access to ChatGPT is limited, and to similar forums for mathematics, where ChatGPT is less capable, activity on Stack Overflow significantly decreased. A difference-in-differences model estimates a 16% decrease in weekly posts on Stack Overflow....
*Reference: Are Large Language Models a Threat to Digital Public Goods? Evidence from Activity on Stack Overflow. Maria del Rio-Chanona, Nadzeya Laurentsyeva, Johannes Wachs. arXiv:2307.07367.
The article might refute the claims made by SE/SO that the banning of users posting ChatGPT/AI generated content is/was the cause for the loss of (new) users on SE/SO.
The volume of users who post 3 or more answers per week has dropped rapidly since GPT’s release
While this value has been dropping slowly over time, it’s been dropping at a well-characterized rate. And, it’s been consistent for many years – since late 2016, with some fluctuation, of course (particularly during the onset of COVID). Nominally we would expect to see this behavior continue; however, after the rise of GPT, the slope inflects and there is no recovery present. In total, the rate at which frequent answerers leave the site quadrupled since GPT’s release.
Reference: GPT on the platform: Data, actions, and outcomes (Meta Stack Exchange)
Quite contrary: it might be that just because of ChatGPT/AI answering questions, that there were no reason for (new) users to interact with SE/SO to add answers.