There is no "Official List of Banned Topics."
But here are some no-nos. This list is off the top of my head and is not complete.
Guns, abort-tion, ra-pe, drugs, mod bashing, promoting other forums, Covid, and Politics or Religion outside of the P+R forum.
Those topics are too "hot button" for a bicycle forum, inevitably lead to heated arguments, and create too much work for the non-paid, all volunteer, moderator staff.
I hope that this helps.
Thread closed.