Why does Part 107 prohibit small unmanned aircraft from transmitting ADS-B Out without authorization?

Why →If the many small UAS operating at low altitude all broadcast ADS-B Out, the resulting flood of targets could saturate ground and airborne systems and generate frequent, unnecessary traffic-alert and collision-avoidance (TCAS) warnings in manned aircraft. To protect the integrity of the air-traffic system, Part 107 keeps drones off ADS-B Out unless specifically authorized.

The trap →The GPS-interference option sounds technical but is incorrect; the concern is system saturation, not navigation interference. The 55-pound option misstates the rule as a weight-based ban, when in fact it is an operating prohibition that applies to small UAS regardless of exact weight.

Field note →Tie the reason to the scale of drone operations: thousands of low-altitude targets would bury real threats in noise. The prohibition keeps the warning systems on manned aircraft meaningful.