Because the need is fulfilled adequately. They are not solving anything new or revolutionising anything old, these are dumb ideas for dumb people to throw money at hoping it sticks.

At least with respect to aviation, we don't have any non-combustion power-trains that can remotely come close to the power-to-weight ratios of turbine engines.

The earliest cars were replacing the animal muscle power of carriages--a trivially easy feat given that the most primitive steam and combustion engines easily 10x both the raw power, power-to-weight, and power-density of a team of horses.