ConcernedApe, the man who created Stardew Valley, is now the publisher of the title on Switch. When the game first released for Switch, publishing was handled by Chucklefish Games. That is no longer the case, as the publishing deal between ConcernedApe and Chucklefish Games has been cancelled. Support for the game will continue as usual, so don't worry about any troubles ahead.
Stardewing it on his own