The law now bans app store operators such as Google from requiring software developers use their payment systems - a requirement which effectively stopped developers from charging commission on in-app purchases. read more
KFTC said Google hampered competition by making device producers abide by an "anti-fragmentation agreement (AFA)" when signing key contracts with it regarding app store licences.
Under the AFA, manufacturers could not equip their handsets with modified versions of Android, known as "Android forks". That has helped Google cement its market dominance in the mobile OS market, the KFTC said.
The regulator said the fine could be the ninth-biggest it has ever imposed.