Why don't you guys read the article? They have gotten money for FOUR exploits SO FAR. They WILL GET MORE MONEY.
It shows 4 payments but it doesn't state 4 exploits. Considering there are words like "vulnerabilities" && "system memory leaks" then the text clearly suggest there were more discoveries than one in each segment (payment breakdown).
As part of Apple's Security Bounty Program, the group was able to receive considerable payments for some of their work. As of Sunday, October 4, they had received four payments totaling $51,500. This included $5,000 for disclosing the full name of iCloud users, $6,000 for finding IDOR vulnerabilities, $6,500 for access to internal corporate environments, and $34,000 for discovering system memory leaks containing customer data.