It is a mystery
Tory Lanez Stan
Dont forget the pretty cure/PreCure which is also under ToeiOne Piece
Dragonball
Sailor Moon
Digimon
Yugioh
Saint seya
Hokuto no ken
All this money and they are still consistently one of the cheapest looking and WOAT studios
Although its mostly been bushed when it comes to international appearances, its successful enough in Japan to be a series on its 17th complete anime iteration with Healin' Good Pretty Cure.
Most anime dont make enough to even get a second season and Toei is cleaning house with the Precure series.