There's been a lot of criticism towards Nintendo's Creators Program but honestly it is their content and they own it so there's nothing wrong demanding to get a cut on those who use their products for their videos.
After all, we as customers own a license to play video games rather than actually owning them so that's something that no one can change or deny (it says on the T&Cs).
Nintendo/Sony/Microsoft/Sega/etc made the game and you're playing it so if anyone's entitled to be paid for it are the owners of it but luckily they're allowing you to get paid for it and perhaps even make a living off of it, so they're actually being quite reasonable.
Link to the Nintendo's Creators Program: https://r.ncp.nintendo.net/guide/
Here's a video if you'd rather just watch it:
I entirely agree with Inside Gaming & PewDiePie, too.