I have been told that is shaped by IP law in Japan being extremely strict, but I don't know if thats true.
That being said, as someone who loves AM2R its my understanding that Nintendo had a remake in the works before AM2R was released or something to that effect. I'm glad they waited until it was released to get shut down, cause people reverse engineered it, and last I saw its still getting updates and has both a PC and android release. 10/10, highly reccomend