I run it on a tiny DigitalOcean VM, but might migrate it eventually to something like a raspberry pi. Initially, I didn't even want it on my network, although I'm gradually getting more comfortable with it. I still think putting it on something like a guest vlan would be prudent.
There's no reason to put it on expensive hardware; all of the work is being done in the cloud anyway. People going out buying $1k Mac Minis don't understand the technology or are trying to run local models, which at least for now are quite far behind. The better frontier models are also significantly more resistant to prompt injection attacks, which are a significant risk factor (even if you don't give it access to sensitive information, everything you do with it is subject to exfiltration by a bad actor setting up a booby-trapped page).
Nice thing about running it in an isolated environment is that you can gradually give it more access to low-stakes things as you learn the limits and failure modes. Folks just dumping it on their production machines are doing the tech-equivalent of base jumping, imo.