Many of the smaller ones, for sure. And most locals and maybe even some regionals will fall under these “community tournament” guidelines as long as they have fewer than 200 entrants and aren’t for profit. However, Nintendo has been pushing tournament organizers to pay for a license to run those tournaments since at least early 2022 under the threat of legal action.
For example, some of the major tournaments of 2023 did get a license from Nintendo. Usually you can tell because (at least for Melee) they won’t have the clean Slippi playback and Pokémon Stadium is not frozen. I can’t speak for the TOs, but I would assume The Big House was licensed