Rockstar Games’ fans had to wait a long time until GTA became available for Nintendo portable console. The first game to be ported to Nintendo Switch is Grand Theft Auto 3, the classic entry in the series. The game was ported by German programmer Adrian Grabber. He utilized the assets of GTAmodding/RockstarVision team to make it work on Nintendo Switch.
Since Rockstar's parent company Take-Two interactive is against such projects, we can expect further escalation to the court and the port taken down due to copyright violation.