1. They launched in China without registering a trademark
2. A competitor registered the trademark after 3 months of their launch
3. They continued to sell for 4 years under a name trademarked by another company, making $73,000+ yearly from that one country
Now, they complain about it on Reddit, even though China is a 'First to File' company.
The fault lies entirely with Playsaurus, nothing illegal occurred here.
https://www.trademarknow.com/blog/first-to-file-versus-first...
This situation could have occurred in many other countries - the difference is probably that the competitor is content to just sell in China, under a Chinese name, whereas products sold anywhere else would need to use the English name.
Edit: Apple taking down the game worldwide is unusual though.