password of webhosting account changed

Tax payer money is repeatedly wasted for corporate espionage in India and the passwords are repeatedly changed as the hackers try to take control of the webhosting account
When the hackers do not want to pay the webhosting bills, why do they want to take over the webhosting account,
Why are they wasting their time to change passwords?
After changing passwords they will put multiple ads on the websites on the webhosting account to check if the person still has control of the webhosting account, on 12 December 2015 three ads were placed on hacked website