Unofficial word from someone at the FAA is:
It's illegal to fly a drone over 250g and over without registering and broadcasting but the FAA won't be chasing violators if they're over a few grams unless it contributes to an incident report.
Putting aside any feelings for Musk and Tesla I don't think it makes any sense for them to move into this market. Manufacturing drones would be significantly different to any of the existing products and there's no guarantees that DJI will...