why is wit studio animating this?

245678 said:
não me parece um anime que vai dar muito retorno ao estúdio deveria estar animando obras mais famosas com mais potencial de se tornarem mega sucessos..

Revenues from international licensing, and pretty much every other way an anime can make money, don't filter down to the people paid by the animation studio. It DOES directly pay a few prominent members of the staff, such as the original creator, the director, and the head writer, who all enjoy royalty payments. But if the show is a hit, the company tasked with making the show doesn't see an additional dime. They were tasked with doing a job for a specific price, as if they were being paid to cut the lawn.

Unless the studio is also on the production committee--which, as you said, is rare--they are simply a contractor. They're fundamentally no different from a contractor you might hire to put a new floor in your kitchen: they are hired to do a specific job according to a contract that both parties negotiated. The studio gets paid a fixed amount of money. It's the production committee and its members who make (or lose) money based on streaming revenue, disc sales, merch, and so on.