

Minitel was a text only early internet that popped up in France in the 80s. You connected to it through a small terminal connected to the phone line, and had access to various commercial services such as phone book, train booking etc…
Most of those services have been shut down a decade or two ago but some hobbyists are operating new services on the network.
You made me check the average density of earth and, yeah, good is 4x denser than that. I’m not sure about the black hole thing, though. Would it be enough mass to collapse or would it just sit there?