Things are pretty brutal and some categories are more affected than others.

A/D seems to be somewhat less affected.

Brutal as in, heavy AI usage? What sort of categories are more affected?

From what someone told me rev/crypto/misc are the most broken, with pwn/web being more iffy and depending on challenge specifics.

I can't speak on AI usage very clearly (fun fact: just putting the challenge into ChatGPT's web UI sometimes works!), but I think the most egregious is orchestration platforms for agents (with MCP/whatever else) to autonomously solve challenges.