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After shutting down several popular emulators, Nintendo admits emulation is legal
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
Piracy protection is things like encryption, firmware checks, pairing systems, unique game identifiers per instance of game, unique console id's, ... Basically any system put in place to make, or identify, a game/console to be genuine or make sure a genuine game running on genuine hardware and nothing else.
These are all systems the switch had btw.
Switch emulation bypassed or faked all of those, which counts as piracy protection circumvention.
Where is this defined?
At least in the DMCA I believe