The accusation that DJI is using its drones to spy on the US and scope out particular facilities for the Chinese government seems pretty wacky and the company itself told the New York Times that the memo was "based on clearly false and misleading claims."
But this isn't the first time that the US government has butted heads with DJI. In August, a US Army memo directed its members to immediately stop using all DJI products due to cybersecurity concerns -- something that the Australian Defense Force also did temporarily. Shortly thereafter, DJI released its Local Data Mode, which allows users to cut off drones from all internet activity. And there have been some legitimate security vulnerabilities brought up in regards to DJI's systems. But the idea that one of DJI's main goals is to spy on the US seems pretty absurd.
In a statement to the New York Times regarding the ICE memo, DJI said, "The allegations in the bulletin are so profoundly wrong as a factual matter that ICE should consider withdrawing it, or at least correcting its unsupportable assertions."