You don't think that more people use Apple iCloud in Japan or India (total population 1.5 billion) than in Liechtenstein (total population approximately 0)?
Liechtenstein is a part of the EU and is subject to the same regulations as the rest of the EU. Launching a product in Japan or India require an entirely new set of legal and regulatory work.
No it isn't, which is why Apple specifically calls it out when they also have an entry for "the European Union". Economic Area, yes, Union, no. And Switzerland is part of neither and has their own data regulation separate from the GDPR.