Some have lambasted the change, saying it will hurt the ecosystem's small, independent players. And even if certain players violate Apple's guidelines, it's unclear how that behavior would even be discovered, or whether they'd be kicked out of the App Store for violating the rules. Apple's change, which was supposed to launch earlier this fall but was delayed to give app makers more time to retool their advertising systems to comply, will take a privacy option that was previously buried deep in users' phones and put it front and center when they open an app. With the change, iPhone users will...