Buy a game capture USB device
The Switch has no game capture or streaming built in. Just don’t share anything that shows you playing demos, that could get the video removed.
How shitty are the cheap unknown brand ones?
The reviews are for something else. Different brand then what I’m looking at, good job Amazon. The picture shows a different brand then the title.
You can get a PCIe card for less, but it only does 720p, probably good enough anyways, for the Switch. And for my shitty upload speed.