When you say we would not have Tesla or SpaceX, do you just mean the brand? Or that we would not have reusable rockets and electric cars?

That seems unlikely, considering the USSR produced the space launches, and electric cars existed before Tesla. Without billionaires, you'd also lose the Koch's making it hard to move away from fossil fuels, which I think would make electric cars significantly easier, rather than harder

If you just mean that we won't have those brand names, should I care? It's just a name