https://www.reuters.com/article/us-tech-antitrust-apple-exclusive/exclusive-iphone-app-makers-questioned-in-u-s-antitrust-probe-of-apple-sources-idUSKBN1ZY29M

The U.S. Justice Department has reached out to app developers as part of its investigation into Apple Inc , one of the four big tech companies being probed for alleged anti-competitive behavior, according one of the developers and another person familiar with the investigation.