And it plausibly helps support the snow. There is a legitimate purpose.

we have issues in the UK with something like this. if you pay road tax you can park anywhere that isn't parking controlled, including outside peoples houses (so long as you're not restricting their access to the highway). some homeowners started putting traffic cones out to "reserve" the spot outside their homes (you cant legally do this btw).

People would just push them out of the way with their cars so homeowners started filling them with concrete.

Putting one of those in the road absolutely can and does get you in trouble

The post itself is just clickbait, but legal consequences are not all that clear. It's honestly mostly about intent.

Here's a case where a guy's mailbox kept getting run over so he rebuilt it with a railroad tie and an 8" pipe burried 3 ft in the ground packed with concrete, and the guy who smashed it destroyed his car and paralyzed himself. https://www.courtnewsohio.gov/cases/2021/SCO/1124/201057.asp#.YaUu6xZOnDs

It went all the way to the Ohio Supreme Court where they found with a lack of intent to harm, the owners were not at fault, but that's a near miss. He said he filled the 8" post with dry concrete mix so if it rained it might 'firm up' which is sus and then buried it 36" in the ground testifying he was confident it would 'lay over' if struck. I'm not saying he wasn't morally in the right, but there's no way those to statements were factual accounts of how that went down. of course, the driver seeing an 8" post under a mailbox would have been equally insane trying to run through it. I'm thinking with a different set of lawyers, intent wouldn't have been all that hard to prove.

Also, could you imagine needing to employ a lawyer through several court cases, an appeal, and ultimately state supreme court hearings to keep from being responsible.