A ghost to most
By 
While he brings his idiotic ideas to Twitter, it’s worth noting that his hole-digging company is basically vaporware that exists solely to undermine actually potentially viable mass transit proposals:
The unsolicited proposal from Elon Musk’s tunnel-building venture arrived in January 2020. To the local transportation authority, it felt like finding Willy Wonka’s golden ticket.
Officials had started planning for a street-level rail connection between booming Ontario International Airport and a commuter train station 4 miles away, with an estimated cost north of $1 billion. For just $45 million, Mr. Musk’s Boring Co. offered to instead build an underground tunnel through which travelers could zip back and forth in autonomous electric vehicles.
Dazzled by Boring’s boasts that it had revolutionized tunneling, and the cachet of working with the billionaire head of EV maker Tesla Inc., TSLA 0.03%increase; green up pointing triangle
the San Bernardino County Transportation Authority dumped plans for a traditional light rail and embraced the futuristic tunnel.
When it came time to formalize the partnership and get to work, Boring itself went underground—just as it has done in Maryland, Chicago and Los Angeles. Boring didn’t submit a bid for Ontario by the January 2022 deadline.
One thing that comes through in these stories is how impulsive and puerile the guy is:
The Boring Co., based in Pflugerville, Texas, occupies an odd place in Mr. Musk’s business empire, which includes Tesla, Space Exploration Technologies Corp., or SpaceX, and most recently Twitter Inc. He launched the tunneling venture with a tweet in December 2016 that many took as a joke. “Traffic is driving me nuts. Am going to build a tunnel boring machine and just start digging…” Mr. Musk wrote.
“I am actually going to do this,” he added in a second tweet.
I want to never have to sit in traffic without having to be around other people and I want it NOW, and forget that this combination of desires in growing urban areas is nonsensical!