Nobody that actually wants to commit felonies would waste their time doing that.
Don't misestimate 4chan.
Presumably the machine wouldn't have Internet access.
This is a good point. When I first got dropped to a shell in a broom/IT closet, I thought gees I hope I don't accidentally fuck anything up. 4 days later I had to acknowledge I could barely intentionally fuck anything up.
I imagine people looking to be disruptive will seek out a 'start9' equivalent. I don't know whether or not there is one.