GPS, mobile network tracking, IP, region the device is sold in (us iphones have a block of plastic where everyone else has a sim card slot), apple store region.
Also VPN, fake apple store region. If detected during download/install also RF-shielding to prevent GPS and mobile network (if download, also needs a wifi signal inside the shield to download at all).
Lot of workarounds for lot of possible detections.
Google loses antitrust case vs Epic Games. Jury rules Google Play store constitutes an illegal monopoly (www.theverge.com)