Since the game's inception, Niantic has pretty much taken a back seat to any kind of community organization, instead leaving that in the hands of local community leaders via Discord and such. The game lacks a messaging system, a way to tell if friends are online and available for PvP, and offers no way to tell if others are doing a nearby raid other than going up to the gym and seeing if other people are in the lobby. For a socially interactive game, it's always been rather lacking on the support end for bringing people together.
I imagine they'll do more or less the same with tournaments, unless they can make a profit from them. Then, that might change.