I think that if the site was updated to be functional on mobile the player numbers would go back up
I'm not so sure. This game is from a different age.
People want Candy Crush Shadow Raid Pokemon these days. Pay to win mechanics and adverts.
I feel that but even I am deterred from playing as much due to lack of UX/UD on mobile. It's 2023 and Chief had promised a newly revamped site design that never materialized. It's not hard to code the css to be more functional on mobile