I mean, it's not like, rocket science to basically boil down your page (which I don't fundamentally disagree with) to "we should put these things in a jail". As I already commented here I implement this for myself at the whole operating system level. There's lots of ways that have existed for a very long time to do things like freebsd jail or chroot or similar so it's not really a novel concept.

Edit: I am completely in agreement with you that we need to remind people that running a lot of these harnesses/agents and LLMs gives them access to everything in your user profile. Some of works so well now, so rapidly and so painlessly that it's easy to forget about what could happen if it went wrong.