My cat will play fetch for as long as I throw her little mouse toy. She'll even let me throw it from bed and she'll bring it right back up for me to throw again.
So cute! My Maine Coon played fetch too. He preferred the shiny little balls of tinsel, but would also play with toy mice. I never taught him, he just brought me a toy one day and stood on my chest so I threw it to get him off me (he was big) and he brought it back. After a few times doing this I realized I was playing fetch with him and we did it his whole life 😊