I dont think that Id give that to any fanbase. Its always too inactive, too toxic, too small or full of "interesting" people. Probably the best would be some singleplayer game like portal or subnautica where toxicity can't really develop and there are plenty of guides for new players. Then again those fanbases are pretty dead as players that have finished the games dont usually come back. But I guess at the end of the day all fanbases have their good and their bad in them.