Banned from a forum by a "host"? [View all]

I think either last year or the previous year I was banned from a forum by a host. I can't recall the details. To be honest I'm not suffering a crisis from it, and I find the DU set up to be fine. However, it does seem a bit arrogant for a single individual to have the ability to ban comments forever. The whole idea seems a bit inefficient, because it creates an environment where there's no debate (the forum becomes an echo chamber where all participants have to more or less agree with the host).

Conversely, if a forum is ruled in such an autocratic fashion, is it possible to create a parallel forum which could be labeled "forum subject yy, diversity of opinion encouraged"?