I just retrofitted my basic hand crank mill with a 10mm nut, and drove it with a drill. It's so much faster now, but I do wonder if there's actual properly motorized versions of what I just did.
The Hario burr grinder in the OP is not on the same level. The one I had was about $40, and was so slow to grind that the drill was a gigantic upgrade. It cost me $.50 in parts to use with a drill I already had, which was great for college me. Cost was the deciding factor.
When I was choosing between entry level electric grinders, I was down to the Baratza Encore ESP and the Fellow Opus. One of the main reasons I chose the Opus is because it was so much quieter than the Encore.
$100 for a kitchen implement that grinds coffee and does nothing else is more than a lot of people are willing to spend. I have one that was given to me and I really like it, but I wouldn't pay that much any day of the week. If I had an extra hand grinder, I'd honestly probably do something like this for fun, because I already have these tools for work.
I understand. I hate single use tools. But if I am spending fairly decent money on beans, I want a tool to properly process them. A $20/200g bag of beans is wasted on a Skerton. Other than the beans, a good grinder is the single most important tool in making good coffee.
Also keep in mind that now it is possible to get a far better hand grinder than the Skerton for almost the same money. The Timemore C2, the 1Zpresso Q, Kingrinder K1, P1, and P2 are the same price or only $10 to $20 more than the Skerton and all produce far better grinds.