Whilst several traditional automotive manufacturers have entered the EV market, their offerings (with the exception of Hyundai and Kia) seem to have a problem matching the range and efficiency of Tesla cars - even those that cost more. It seems that, in their years of manufacturing EV batteries and battery management systems, Tesla has some secret sauce that others have yet to discover.
Then there's charging: Tesla has a global network of DC chargers, which are free at the point of use and easy to use - which makes long journeys viable and straightforward in a Tesla. While a number of manufacturers are involved with Ionity's rollout of DC chargers, they are years behind.
Significant competition for Tesla may come from Chinese EV manufacturers, some of whom have been quietly selling EVs in large numbers in China and elsewhere.