https://x.com/elonmusk/status/888053175155949572 "Just received verbal govt approval for The Boring Company to build an underground NY-Phil-Balt-DC Hyperloop. NY-DC in 29 mins." (July 2017, years after saying he wouldn't build it himself.) Technically it's not a commitment to build, but any other leader in the market would be considered to have failed if they made such a statement and then quietly abandoned it.

Yeah under that post he also says "If you want this to happen fast, please let your local & federal elected representatives know" and "Still a lot of work needed to receive formal approval, but am optimistic that will occur rapidly". Not just "technically" not a commitment to build. Clearly dependent on other factors.

Go ahead and count it as "abandoned" if you want. He did talk about building a Hyperloop and is not currently pursuing it directly. But I think failing to win required government approval/funding is a bit different than capriciously giving up on an idea, and The Boring Company itself is far from abandoned. Very different from the solar roof which is unambiguously a commercial failure.