Of all the emulators, this one is the least surprising.

Games were playable and available on Switch emulators Day 1 or even earlier, something that they can cite as real and actual sales losses, unlike most emulators which are for no longer produced hardware.

And I wager the leak of Tears of the Kingdom was the final straw for them, because it was both available weeks in advance, but also convinced a lot of people not to buy their terrible expansion pack at full price.