Yes, QSD was hosted on a Minitel serving node/system but was mainly used for international chats. So we can say that QSD “abused” the x25 interconnection of a Minitel server in order to provide chats mainly to hackers.
Common people there: BayernPower, Gandalf, ... long time ago.
I remember some dude abusing a VAX that had x.25 access to connect out to all that stuff. "SET HOST /X25", anyone? Word spread like wildfire. At one point every elite dude and his mother was on the system. I think it took a little over a month to figure out something was awry. Probably the Sprint / Telenet bill was a clue...
Common people there: BayernPower, Gandalf, ... long time ago.
It was 0208057... something iirc.