GitHub link to Nintendo's claim - all the details you need are here
The emulator forks which are being taken down are as follows:
Despite this, the one fork that continues, and will continue without takedown is Ryubing - by Greemdev. This is created by an original member of the Ryujinx team. It's safe, the code is beyond reproach (and violates zero laws or Nintendo code) and actually brings helpful updates.
Still...shitty news. And more indication that the Switch 2's architecture will be damn similar to that of this current Switch. Them taking emulators down means the upcoming games have a solid chance of being emulatable on release. But...that's my own (and others') conjecture, so we'll see when the time comes.
Nintendo got one guy's paychecks garnished for the rest of his life. So even if you have no money there is a lot to lose.
They threaten a crap ton to scare devs into not entering court, but tbf I'm pretty sure the guy they got was for actual piracy, and the court ordered the millions in alleged damages to be paid in $40 installments to Nintendo per month for the rest of his life.
Edit:
It was set at 20-30% of his salary so yeah I guess that's still a pretty hefty chunk of change.