Maybe there's some confusion about the definition of a monopoly here.
For valuation purposes I'm not using the layman definition of 90%+ market share and total dominance. Instead I use the economic definition of monopoly: dominant market position with
pricing power. In the U.S. there are precedents of companies with just 40% of market share to be convicted of being predatory monopolists.
Tesla already has a significant pricing power in their favor, but instead of rent seeking and profit maximization they chose to price aggressively to transform the ICE market faster and grow.
All the other examples I gave have dominance and pricing power in their markets: Microsoft, Google, Paypal, SpaceX and even Apple with their ridiculous profit margins.
Pricing power in their segments is what is required to gain the market valuation of a monopoly - which is the primary factor to
@FrankSG's thesis.
JFYI, Warren Buffet almost exclusively invests in quasi-monopolies, and yes, they exist all around us.