i havent played a nintendo game since GBA times but lets look at the couple of examples
Pokemon is one of the most expensive IPs out there, yet i dont understand the craze over it. its basically the same game that they were selling for alike 15 years and only 5years ago they spiced a formula a bit with the 3rd person camera. And games objectively look like shit, seriously why does a Pokemon game looks worst than a idie game.
Zelda is probably the only game that i can check out since it looks actually fun and not just a platformer game.
As far as i know Metroid shit the bad really hard and everyone hated it despite a decade of waiting.
Kirby and Mario i consider a baby game. if you are 20 something playing these games i think theres something wrong with you. its like seeing a grown ass man watching cartoons.
As far as YouTubers go Nintendo were historically dicks about everything copyright. They take down any fan-project that gets a spotlight.