Some years ago in the UK we had to have a light on any car that was parked on the street overnight. To save the battery leaving the side lights on all night people had a single lamp that clipped on the door window.
There were several people who built units that, if they lived close enough, took the signal from the BBC Long Wave transmitter and charged a big capacitor up, this was fed to the bulb and the parking light lit up without draining the battery.
Then the powers that be got wind of it, and lots of people were taken to court and charged with stealing electricity.
If you try it and you are successful don't shout about it too loudly in case some smart ass tries to earn himself browney points at your expense.
That's silly... it's a radio transmitter, intentionally sending out energy for intended reception. So what if my "radio receiver" 'happens' to store some of the 'signal' and light up an LED? It's not stealing, they would not be able to prove it caused their transmitter an undesired "drain". Nor can they prove it affects the signal reception by anyone else's radios. Crystal radio sets utilize the transmitted power directly to drive the headphones, are they illegal?
In fact, there are now... on the market... devices designed specifically to receive broadband radio signals, rectify them, and use them for IOT devices.
Did you ever think about why it is that having 1,000,000 radios does not decrease the transmitted signal? ...and even if you added 1,000,000 more, my radio receiver signal won't get any weaker?
Tesla thought a lot about that... it's what his "Magnifying Transmitter" at Wardenclyffe counted-on... AC power distribution free to the masses... just install a specific antenna and reception device, and free electricity. Once you move to the transmitter energy out of normal electro-magnetic transmission and into wavelets or longitudinal waves, adding millions of receivers won't subtract from the original power.