The FAA does not allow the use of ADSB-out for sUAS. Anytime you are flying in controlled airspace. Only when flying in a Temporary Flight Restriction.

The owner of the aircraft. The operator of the aircraft. The manufacturer of the aircraft.

Only when the operator will be paid for commercial services. All civilian small UAs weighing greater than .55 pounds must be registered regardless of its intended use.  When the small UA ...

0.55 pounds or less.  0.75 pounds or less. 0.65 pounds or less.

If the owner is less than 13 years of age. If the owner does not have a valid United States driver’s license. All persons must register their small UA.

The National Transportation Safety Board. Upon request of the Federal Aviation Administration.  Air Traffic Control.