Vimm's Lair has been running since 1997. How has it stayed up so long without Nintendo suing them into oblivion?
That's actually a brilliant question, I'm not even entirely sure on how Vimm keeps it up but kudos to him regardless.
For speculation I'd say that because of his 2 gen vault rule that only currently rules out 7th gen to be acceptable, Wii, PS3 and 360 that doesn't seem to be a priority for takedown by many major companies thus.
It also helps that he is a non-profit, unlike others he doesn't take donations and has adds but it's pretty much to pay for his expensive hosting the servers.
Say what you will but the shear fact that only Vimm and a few people Keeped the site alive for nearly 25 years is nothing short of remarkable and astounding.
But the factual reason, IDK you'll have to find a way to ask Vimm.