"Ask HN: Is anyone using PyPy for real work?" from 2023 contradicts you about PyPy being a toy. The replies are noticeably biased towards batch jobs (data analysis, ETL, CI), where GC and any other issues affecting long-running processes are less likely to bite, but a few replies talk about sped-up servers as well.

https://news.ycombinator.com/item?id=36940871 (573 points, 181 comments)