I beg to differ. I took one, defanged it (well, I let it keep the claw in the name), and turned it into a damn useful self-modifiable IDE: https://github.com/rcarmo/piclaw
Yes, it has cron and will do searches for me and checks on things and does indeed have credentials to manage VMs in my Proxmox homelab, but it won't go off the rails in the way you surmise because it has no agency other than replying to me (and only me) and cron.
Letting it loose on random inputs, though... I'll leave that to folk who have more money (and tokens) than sense.
Besides the web ui, what can it do that pi agent in a terminal can do?