A general Mafia-style newspaper: sharing experiences between forums.

If it gains traction, it will be easier to gather players.

Indeed, another argument in its favor. A call goes out: "Guys, there's a mafia on this forum, and we can't seem to get enough players, come on over, hurry up, the game has these and these features, here's a link to the forum, we welcome you to our little community," and people start joining.
It will also be possible to introduce a more specialized forum structure, where those who specialize in certain things will run specific mafias, and players from all forums will move back and forth depending on what they want to play at the moment. Or even the opposite, we can learn from each other and run mafias based on other people's templates or with elements of other people's templates, and other people, accordingly, will borrow from us what they like. In general, it's a promising idea.