In almost all cases of Elon having one of his companies do something good, he was more of a hindrance than a help.

"Starship doesn't need a deluge system"

"Put the charge port on the left hand rear, because that works better for the garage of the place I'm renting in Bel Air" (Yes, really)

SpaceX is his most successful company, and it's also the one that's best at keeping Elon away from anything that matters.

LEO Internet satellites aren't a good idea. They're threatening Kessler Syndrome and fucking up radio telescopes. It's also convincing other spacefaring nations that they also need LEO Internet satellites, and that's only going to make those problems worse. Just lay fiber.

Then there's the Boring Company. "Digging is easy, you just need to ignore environmental regulations and everything will get done quickly and within budget", Elon thinks. Well, he did ignore environmental regulations, but it didn't get done quickly or within budget. The Las Vegas Loop is a low throughput novelty (so perfect for Vegas, I guess). Any moron can increase the capacity of the system by orders of magnitude just by putting some rails in those tunnels.