Being mildly gullible after being exposed to earthing I gave it a try for a while, in summery weather, No, I didn't try barefoot running, but I did change the way I ran.
My impression is favorable.

First I approached this with all due skepticism and evaluated it for scientific merit. I do not think there is any demonstrable electrical grounding effect at work here. Consider that we touch all sorts of things connected to the planet constantly. This activity is grounding.

There are physical effects of walking barefoot, and reclining upon the ground, hanging on tree limbs, and being outdoors in the natural light, day or night. These effects are many. And I think all of them may be salubrious, or injurious, depending upon perception.

For those of us who may not be accustomed to walking in bare-feet or laying on the ground the experience will be uncomfortable and even painful. Pain biofeedback tells us to stop doing what were doing. When we persist in the activity it causes our brain to work creatively in new ways. This in itself may beneficial by introducing a new experience. Immediately we are forced to adjust. I found myself compensating by paying close attention to the ground and picking places to walk leading with the ball of my foot so that my foot falls more gently. If I stand, I have to find a comfortable position and pay attention to how I distributed my weight. This leads to changes in posture. Sometimes I modulate the discomfort, just to see what I can put up with.

I'm certain that if I went barefoot all the time I would have horrible injured feet. I do not believe in some sort of ideal that involves living bare foot.

When the weather and ground is favorable I've always given this a try on our frequent camping trips. Most times I go swimming in natural bodies of water I enter and leave in bare feet on various natural surfaces. I count that as earthing.

I do think it could be beneficial for all kinds of maladies, mental and physical, but it's not medicine. It is a behavior.

Now if someone would make a thread topic about bare-foot cycling that would be more on topic. There was a person who rode an upright three-speed type of bicycle that I would see from time to time on my bike commute who rode in barefeet and shirtless no matter what the weather brought. I don't think he was a houseless person. He rode strong (I'm thinking to keep warm) and his pedals looked like the cheapest plastic ones - not exactly barefoot friendly. He had "cement-foot" ; the condition where the callouses are so thick they are white and cracked. His shirtless torso was sunburnt. Altogether it looked like a bad idea to me. However he did get a lot of attention, and perhaps that was some compensation. It did look like his practice was painless.

One thing I notice after a long session of earthing is that I need to take a crap pretty soon. Weird I know.

To each their own I say. If it can be practiced harmlessly and doesn't offend anyone there's nothing wrong with it.

From time to time I'll see people earthing and nude sunbathing simultaneously. The law may not permit it. This could be the best therapy ever.

I could go on.

The last thing I want to express is how this may relate to the practice of accupuncture. This is also dubious. However there could be something to it. If your foot is randomly stimulated by things sticking into it from the ground, who knows, maybe you'll strike the perfect chord and unlock the secret to nirvana.