There might always be an ambitious team trying to compete with Ethereum  and the fact that crypto technology is usually open source takes away the edge other tech companies have. A company like Microsoft was so hard to copy because the code was closed source. With a car company it becomes easier because you could buy the car and dissemble it. When you take Tesla as an example it already becomes harder as these cars are run a lot based on different softwares that work inter connectedly. In Ethereum you look at the code and you can think about it and play around with it. What you can't copy from Ethereum is the ecosystem around it though. You need to start from scratch when it comes to convincing people that you have the better product and even that is no guarantee because you may not reach critical mass, and without that your network is dysfunctional.