It's easier to leave a forum than a country. Forum-dictators who abuse their power end up with empty forums.

Real world dictators who abuse their power often end up dead. (But perhaps not as much as real world dictators who do not abuse their power enough to secure it.)

Perhaps I misunderstood what ArisKatsaris was saying. I thought he meant something like this:

Dictators in countries tend to make living conditions in those countries less desirable. Dictators in forums tend to make posting in those forums (and/or reading them) more desirable.

If this is true, your objection is somewhat tangential to the topic (though an empty forum is less desirable than an active one). But perhaps he meant something else ?