Hackers / cheaters in war

Because if EA removed the it will be a huge lost of accounts 

And the more accounts,  the better they can negociate all commercial revenue from adds.

Are you sure they're hackers? It's possible they are willing and able to spend lots of real money on the game. If so, they could easily upgrade all the war attacks to maximum and buy all the war supplies they need.

Personally, in the beginning (11 years ago), I was spending $100 USD per month on the game. It's so much easier if you can afford to do that 

There are so many hackers around in this game ! EA has just not the manpower to get rid of them and if they ban sometimes the one or other -> cheater buy a new City with the most important war-cards already @ level 20 and open a new account. So easy to do.