This perverse desire for commercialization is almost comical. It is so effective that I feel like America will be the first country to implement a form of communism once they figure out the business model and produce profit charts showing promising growth expectations.
The American businesses are already coming up with stuff like "sharing economy", billionaires re-invent the metro and call it hyperloop or communal housing and call it AirBnB, public transport and call it Uber :) Publicly traded corporations that are not making any profits from the services they provide and yet providing value for the customers which are often also the owners through stock trading.
What a fascinating country. Being free of baggage and tradition and hacking around a few principles is so cool and terrifying at the same time. Nothing is sacred, there are no taboos and everything is possible.
He did it to kill any chance of the state improving the train/tram network so that Tesla cars would have less competition for public transport
You might ask "why don't they just re-bid the contract?" Answer: The new 'progressive' city government is opposed to building a train for 'rich people' since there's already a non-express metro that goes through some of the most crime-ridden neighborhoods of the city. Of course no businesspeople use it and they all take Ubers (many of which are Teslas)
The last time I took the Blue Line to the airport it was indeed fast and convenient - but dealing with luggage was kind of annoying, and there was a guy smoking weed on the train. If I were traveling for business there's no way I would use the Blue Line unless it was peak rush hour, and indeed most business travelers don't. Getting weed smoke on your work clothes is a less than ideal way to start a trip, nor is getting sweaty in your work clothes from hauling luggage around the station.
Thus the case for an express train - it would capture those price insensitive business travelers. You could charge $20 a ticket and it would still be a significant savings over Uber. Heathrow Express in London is like this and it seems to work well.