Somehow it did not get much attention, but Signal president Meredith Whittaker (together with Udbhav Tiwari) spoke about the risks and threats from AI-enabled systems.

AI Agent, AI Spy

https://media.ccc.de/v/39c3-ai-agent-ai-spy

I also found the talk about Asahi interesting, both from a technical standpoint but also as a nice update what the current status is.

Asahi Linux - Porting Linux to Apple Silicon

https://media.ccc.de/v/39c3-asahi-linux-porting-linux-to-app...

Finally, not recorded, but workshops like

Foundation workshop: Hands-on, how does the Internet work?

by Ingo Blechschmidt, is congress at its best. Getting a diverse set of people with various backgrounds and knowledge levels to ARP spoof in a little over an hour is art.

https://events.ccc.de/congress/2025/hub/event/detail/foundat...