Just because not everything needs to be political doesn’t mean things that are inherently political stop being politically consequential when you say it doesn’t have to be.
Elon in particular has used his wealth to overtly become a political figure. His political power comes from his wealth. Therefore supporting his wealth through your economic choices inherently supports his political activity.
For context, the total length of high speed rail in the world is 59,000km. So China, which makes up 17% of the world’s population contains 2/3 of the world’s high speed rail.
The closest comparison would be Europe, which has about the same land mass and half the population of China has around 11,000km of big speed rail.