The second that road gets defunded by the public coffers, guy with tractor would show back up.
They are unpopular since they effectively require a very small private association to maintain them. They really hurt property values (one reason I bought my place at a bargain price). Most jurisdictions try to prevent creating them because they lead to disputes between neighbours, or poorly maintained private roads become a problem when an emergency vehicle needs to get down one.
The budget for local roads is also quite small, since they don’t carry much truck traffic. My township of 5,000 people or so has 3 part time guys who maintain the roads and a few pickup trucks and a dump truck for hauling the asphalt. That’s it.
The most expensive part of road maintenance is replacing bridges.
I've also connected my private roads to a couple other private roads so no one has a monopoly on my way to town.
As for the "barriers to entry" mentioned in that article, is absolutely wild. My road and most the ones in our grid network were made with little more than a dude and a tractor (I think you can get suitable one for $10k off craigslist). I initially made mine with an axe, a light truck, and a rope (to rip out small trees) and there's nothing stopping anyone adjacent from doing the same if I'd block the road.