SUPANTHA MUKHERJEE and FOO YUN CHEE APPLE threatened to remove apps from its widely-used App Store if they don't comply with an upcoming private feature allowing users to block advertisers from tracking them across different applications. The new feature, dubbed App Tracking Transparency, was initially planned to debut this year, but was delayed to give developers more time to make changes to their apps and address privacy issues. Some tech companies and advertisers, such as Facebook , have criticised the planned change, saying it could hurt smaller developers such as gaming companies disproportionately. But Craig Federighi, senior vice president of…