Yep, The President of Dumb Starbucks Is/Was Nathan Fielder
Indeed, there was a “Dumb Starbucks” that was open for about two days on Hillhurst Ave. in Los Feliz here in LA. It wasn’t sanctioned in any way by Starbucks, but that didn’t matter because it was operating as a parody.
That being said, Nathan Fielder, of course, was behind this whole gag, but, due to not having a proper permits to serve food, Dumb Starbucks is currently shut down.
Take note all marketing firms/ad agencies: this was way better than a teaser/trailer for the next season of Nathan For You.