The data comes from the FAA. It’s public data. All this guy has done is put an interface on it. Unless Swift’s legal team can prove that each individual stalker used an interface hosted by this guy I don’t see how he can be thought of as responsible for anything. And even if they did use an interface hosted by him, he’s still not doing anything other than showing public data. Data that the FAA clearly believe is in a legitimate public interest to make public. If she’s got an issue with that, they’re the people to go after.