Kinetic energy is exactly what’s harvested, which is why modern wind turbines are not far off the theoretical limit of the amount of energy that can be extracted. (Betz’s law)

By taking energy from wind, you slow it down. Slow it down too much, and it can’t get out of the way in time for new air.

That was about the lock in part. Most of the mavic footage I’ve seen seems to be digital at least, though I recall something about them changing the RF frequencies constantly to avoid jamming.

I highly doubt the mavics used in Ukraine still run the stock firmware