Why did Total War Arena fail?

Can anyone tell me why TW Arena failed so quickly? I really enjoyed it and put quite a lot of time and money (under $100) into it and I know I'm not the only one who did. I know the TW community is huge and when I think about it now I'm shocked it didn't last at least the first year.

I apologize if my timeline might be a little off, it's been a while.

If someone could shed some light on this for me I'd appreciate it✌