When I think of Musk.
☆ I think Enron - Houston, TX (HQ) once a time.
■ Tesla - Great (Core) business (for now) and what made Musk's success, but when you look at everything else. Cybercab - Failure, his other business (SpaceX) has to buy them; because no one really wants them.
■ Robotaxi - After several years, a (Few) more on the road; now one more (1) market in Las Vegas. The original (Test) market was Austin, TX. Not exactly, a success; and not where Musk said it would be; by now.
■ Optimus Robot's - Complete failure, no one wants to buy them at $25,000.00 each. Other robots are much cheaper.
■ SpaceX - In progress, (Lofty) unrealistic goals such as the colonization of Mars (take a look at Mar's climate) that will (Never) happen; U.S. Taxpayer subsidized though for rocket launches; and satellite services.
■ SpaceX "Starlink" cellular service - AT&T, Verizon; and T-Mobile (Rejected) a partnership because of an (Inferior) service. Satellite cell service is (Not) available in buildings, and densely populated areas; like at Major sporting events. Now running to Boost Mobile. 5-7 years to build a Fully-Functioning network of their own.
☆ Enron, once a (Vastly) successful business (Failed) because they delved away from their (Core Business - Energy) as Musk is doing right now.