What I find the most interesting is that there is clearly something that makes anime stand out as being its own thing, distinct from the majority of other animated TV, but it's hard to put a finger on exactly what that attribute is and where to draw the line.
The anime community has, for as long as I've been a part of it (13 years or so), decided that anime is "animation made in Japan". This heuristic has actually worked pretty well.
But the lines are increasingly blurred.
- Japanese produced shows are outsourcing some animation to China and Korea, and sometimes taking direct funding and story writing input from the USA.
- Non-Japan produced shows are taking notes on what works, drawing on it for inspiration, and in rare recent cases even outsourcing animation directly to Japan.
- There is a TON of money in gacha games, and the biggest "anime" titles some people may recognize are gacha games, butand the majority of those are run 100% by Chinese companies. Ironically, sometimes sending them over to Japan for the TV adaptation.
Just like food: Italy may have "invented" pizza, but New York pizza is now its own thing.