Making stuff like this still requires specialized software, but software development is far more readily available and accessible. The proliferation of software

Making stuff like this still requires specialized software, but software development is far more readily available and accessible. The proliferation of software is also essentially effortless, so a terrorist group or similar could have a single team supplying standardized designs worldwide. Consider the hobby of FPV drone racing. The designs and plans are widely available, and you can get a top-notch drone for about $2000 for a first-time purchase (less for the subsequent ones, since you'll already have goggles/radios). These drones are regularly built by teenagers and it's not difficult at all to add capabilities to the drones, such as target tracking, autonomous operation, software-defined radios for jamming resistance, etc.