There is without a doubt a variation of this prompt you can pre-test to successfully bait the LLM into exfiltrating almost any data on the user's machine/connected accounts.
That explains why you would want to go out and buy a mac mini... To isolate the dang thing. But the mini would ostensibly still be connected to your home network. Opening you up to a breach/spill over onto other connected devices. And even in isolation, a prompt could include code that you wanted the agent to run which could open a back door for anyone to get into the device.
Am I crazy? What protections are there against this?
Social, err... Clanker engineering!
This is something computers in general have struggled with. We have 40 years of countermeasures and still have buffer overflow exploits happening.