If you go to the disclosures statement at the bottom of the article, you'll learn that one of the authors on this paper—Gaetan Chevalier (a cell biology prof at UC Irvine)—has a financial interest in promoting grounding. His contributions make up a notable percentage of the published literature on grounding, maybe 10-20%? There are not many publications on the topic, since I assume there is a relatively weak level of financial incentive, and it reeks of pseudoscience.

After some digging I have found papers of higher scientific veracity pointing to grounding being useful in reducing inflammation and potentially improving sleep quality. I remember seeing a meta-review come out in 2018-2020 which concluded that there is a warm-level of evidence pointing to a health-promoting effect of grounding on the human body. Some of the papers that met the inclusion criteria I think were assessed to have low quality of evidence, though.

I don't have a strong enough background in science to know who's right here, but I do have sleep problems so I try to do everything I can to improve it. So I do ground my bed and the space near my keyboard so that I spend a decent amount of the day grounded; and I also consider it to be a completely effortless proposition with possibly a positive contribution to my health. Or, in the worst-case scenario, there's no benefit and I wasted maybe $10 on the copper wiring that I used to DIY it together. If I were a betting man my guess is that I will eventually throw this setup away when the science ends up being properly debunked; but I'm open to potentially investing more when the evidence becomes stronger.