Ask HN: What is causing the major growth in new HN users?

This was brought up by someone some months back [1] and was judged by dang to be a spike due to YC applicants. Assuming, the the data here [2] is accurate, what is the explanation for new user growth and are the new users causing any issues?

[1] https://news.ycombinator.com/item?id=35009073

[2] https://hackernews-insight.vercel.app/user-analysis