It's never been ok to pirate a console that is still on the market. Though, part of that is how rare it has been for emulation to be feasible for a current console. But either way, it has always been demonstrably illegal. And especially in the case of yuzu where they were completely flaunting and charging money to play games that weren't even released yet. I honestly put most of Nintendo's current war path on their shoulders. That's not just riding the backs of giants, that's climbing into their faces and flicking them... ask any insect, that is a good way to get yeeted to the ground and for the giant to stop tolerating the previously benign presence of the rest of the insects.

Nintendo has definitely done some over reaches, but going after Switch pirates is not a good example of that.